| (in millions of euros) | Note | December 31, 2020 | December 31, 2019 | 
|---|---|---|---|
| Assets | Assets Note 
 | Assets December 31, 2020 
 | Assets December 31, 2019 
 | 
| Goodwill, net | Goodwill, net Note 11 | Goodwill, net December 31, 2020 10,858 | Goodwill, net December 31, 2019 11 629 | 
| Intangible assets, net | Intangible assets, net Note 12 | Intangible assets, net December 31, 2020 1,509 | Intangible assets, net December 31, 2019 1,979 | 
| Right-of-use assets related to leases | Right-of-use assets related to leases Note 24 | Right-of-use assets related to leases December 31, 2020 1,645 | Right-of-use assets related to leases December 31, 2019 2,122 | 
| Property, plant and equipment, net | Property, plant and equipment, net Note 13 | Property, plant and equipment, net December 31, 2020 626 | Property, plant and equipment, net December 31, 2019 720 | 
| Deferred tax assets | Deferred tax assets Note 9 | Deferred tax assets December 31, 2020 137 | Deferred tax assets December 31, 2019 143 | 
| Investments in associates | Investments in associates Note 14 | Investments in associates December 31, 2020 24 | Investments in associates December 31, 2019 32 | 
| Other financial assets | Other financial assets Note 15 | Other financial assets December 31, 2020 232 | Other financial assets December 31, 2019 218 | 
| Non-current assets | Non-current assets Note 
 | Non-current assets December 31, 2020 15,031 | Non-current assets December 31, 2019 16,843 | 
| Inventories and work-in-progress | Inventories and work-in-progress Note 16 | Inventories and work-in-progress December 31, 2020 230 | Inventories and work-in-progress December 31, 2019 411 | 
| Trade receivables | Trade receivables Note 17 | Trade receivables December 31, 2020 9, 508 | Trade receivables December 31, 2019 10,233 | 
| Contract assets | Contract assets Note 26 | Contract assets December 31, 2020 889 | Contract assets December 31, 2019 1,002 | 
| Other current receivables and current assets | Other current receivables and current assets Note 18 | Other current receivables and current assets December 31, 2020 803 | Other current receivables and current assets December 31, 2019 757 | 
| Cash and cash equivalents | Cash and cash equivalents Note 19 | Cash and cash equivalents December 31, 2020 3,700 | Cash and cash equivalents December 31, 2019 3,413 | 
| Current assets | Current assets Note 
 | Current assets December 31, 2020 15,130 | Current assets December 31, 2019 15,816 | 
| Total assets | Total assets Note 
 | Total assets December 31, 2020 30,161 | Total assets December 31, 2019 32,659 | 
| Equity and liabilities | Equity and liabilities Note 
 | Equity and liabilities December 31, 2020 
 | Equity and liabilities December 31, 2019 
 | 
| Share capital | Share capital Note 
 | Share capital December 31, 2020 99 | Share capital December 31, 2019 96 | 
| Additional paid-in capital and retained earnings, Groupe share | Additional paid-in capital and retained earnings, Groupe share Note 
 | Additional paid-in capital and retained earnings, Groupe share December 31, 2020 7,083 | Additional paid-in capital and retained earnings, Groupe share December 31, 2019 7,305 | 
| Equity attributable to holders of the parent company | Equity attributable to holders of the parent company Note 20 | Equity attributable to holders of the parent company December 31, 2020 7,182 | Equity attributable to holders of the parent company December 31, 2019 7,401 | 
| Non-controlling interests | Non-controlling interests Note 
 | Non-controlling interests December 31, 2020 (22) | Non-controlling interests December 31, 2019 (9) | 
| Total equity | Total equity Note 
 | Total equity December 31, 2020 7,160 | Total equity December 31, 2019 7,392 | 
| Long-term borrowings | Long-term borrowings Note 23 | Long-term borrowings December 31, 2020 3,653 | Long-term borrowings December 31, 2019 4,286 | 
| Long-term lease liabilities | Long-term lease liabilities Note 24 | Long-term lease liabilities December 31, 2020 1,850 | Long-term lease liabilities December 31, 2019 2,196 | 
| Deferred tax liabilities | Deferred tax liabilities Note 9 | Deferred tax liabilities December 31, 2020 247 | Deferred tax liabilities December 31, 2019 413 | 
| Long-term provisions | Long-term provisions Note 21 | Long-term provisions December 31, 2020 468 | Long-term provisions December 31, 2019 426 | 
| Non-current liabilities | Non-current liabilities Note 
 | Non-current liabilities December 31, 2020 6,218 | Non-current liabilities December 31, 2019 7,321 | 
| Trade payables | Trade payables Note 
 | Trade payables December 31, 2020 12,887 | Trade payables December 31, 2019 13,411 | 
| Contract liabilities | Contract liabilities Note 26 | Contract liabilities December 31, 2020 404 | Contract liabilities December 31, 2019 353 | 
| Short-term borrowings | Short-term borrowings Note 23 | Short-term borrowings December 31, 2020 856 | Short-term borrowings December 31, 2019 1 602 | 
| Short-term lease liabilities | Short-term lease liabilities Note 24 | Short-term lease liabilities December 31, 2020 292 | Short-term lease liabilities December 31, 2019 336 | 
| Income taxes payable | Income taxes payable Note 
 | Income taxes payable December 31, 2020 296 | Income taxes payable December 31, 2019 351 | 
| Short-term provisions | Short-term provisions Note 21 | Short-term provisions December 31, 2020 234 | Short-term provisions December 31, 2019 170 | 
| Other creditors and current liabilities | Other creditors and current liabilities Note 25 | Other creditors and current liabilities December 31, 2020 1,814 | Other creditors and current liabilities December 31, 2019 1,723 | 
| Current liabilities | Current liabilities Note 
 | Current liabilities December 31, 2020 16,783 | Current liabilities December 31, 2019 17,946 | 
| Total equity and liabilities | Total equity and liabilities Note 
 | Total equity and liabilities December 31, 2020 30,161 | Total equity and liabilities December 31, 2019 32,659 |