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Details to the consolidated cash flow statements (Details 6) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Apr. 08, 2019
Jan. 01, 2019
Statement [line items]          
Financial debts and derivative instruments at beginning of period $ 27,384   $ 28,532    
Impact of adoption of IFRS 16 Leases 2,005 $ 1,949     $ 1,736
Increase in non-current financial debts 7,126 93 2,856    
Repayments of non-current financial debts (2,003) (3,195) (366)    
Change in current financial debts 2,261 (1,582) 1,687    
Payments of lease liabilities, net (312) (273)      
Impact of business combinations and divestments     14    
Changes in fair values, and other changes, net     (43)    
Amortization of bonds discount     29    
Currency translation effects     (555)    
Financial debts and derivative instruments at end of period 36,044 27,384      
Non-current financial debts [member]          
Statement [line items]          
Financial debts and derivative instruments at beginning of period 20,353 22,470 23,224    
Increase in non-current financial debts 7,126 93 2,856    
Impact of business combinations and divestments     10    
Changes in fair values, and other changes, net (1)   5    
Amortization of bonds discount 16 25 27    
Currency translation effects 832 (141) (462)    
Reclassification from non-current to current, net (2,067) (2,003)      
Current portion of non-current financial debt     (3,190)    
Financial debts and derivative instruments at end of period 26,259 20,353 22,470    
Current financial debts and derivative financial instruments [member]          
Statement [line items]          
Financial debts and derivative instruments at beginning of period 7,031 9,678 5,308    
Repayments of non-current financial debts (2,003) (3,195) (366)    
Change in current financial debts 2,261 (1,582) 1,681    
Impact of business combinations and divestments 32 2 4    
Changes in fair values, and other changes, net   129 (48)    
Amortization of bonds discount 5   2    
Currency translation effects 392 44 (93)    
Reclassification from non-current to current, net 2,067 2,003      
Current portion of non-current financial debt     3,190    
Financial debts and derivative instruments at end of period 9,785 7,031 9,678    
Non-current lease liabilities [member]          
Statement [line items]          
Financial debts and derivative instruments at beginning of period 1,703        
New leases 221 362      
Impact of business combinations and divestments 36 (11)      
Changes in fair values, and other changes, net (30) 33      
Currency translation effects 39 4      
Reclassification from non-current to current, net (250) (156)      
Financial debts and derivative instruments at end of period 1,719 1,703      
Current lease liabilities [member]          
Statement [line items]          
Financial debts and derivative instruments at beginning of period 246        
Payments of lease liabilities, net (312) (273)      
Interest payments for amounts included in lease liabilities classified as cash flows from operating activities (56) (51)      
New leases 73 131      
Impact of business combinations and divestments 8 (6)      
Changes in fair values, and other changes, net 65 20      
Currency translation effects 12 1      
Reclassification from non-current to current, net 250 156      
Financial debts and derivative instruments at end of period $ 286 246      
Continuing operations          
Statement [line items]          
Change in current financial debts     $ 1,687    
Continuing operations | Non-current financial debts [member]          
Statement [line items]          
Lease liabilities, impact of adoption of IFRS 16         (2)
Continuing operations | Current financial debts and derivative financial instruments [member]          
Statement [line items]          
Lease liabilities, impact of adoption of IFRS 16         (1)
Continuing operations | Non-current lease liabilities [member]          
Statement [line items]          
Lease liabilities, impact of adoption of IFRS 16         1,471
Continuing operations | Current lease liabilities [member]          
Statement [line items]          
Lease liabilities, impact of adoption of IFRS 16         268
Discontinued operations          
Statement [line items]          
Impact of adoption of IFRS 16 Leases       $ 269 286
Discontinued operations | Non-current financial debts [member]          
Statement [line items]          
Lease liabilities, impact of adoption of IFRS 16         (89)
Discontinued operations | Current financial debts and derivative financial instruments [member]          
Statement [line items]          
Financial debts and lease liabilities related to discontinued operations   (47)      
Discontinued operations | Non-current lease liabilities [member]          
Statement [line items]          
Lease liabilities, impact of adoption of IFRS 16         246
Financial debts and lease liabilities related to discontinued operations   (246)      
Discontinued operations | Current lease liabilities [member]          
Statement [line items]          
Lease liabilities, impact of adoption of IFRS 16         $ 40
Financial debts and lease liabilities related to discontinued operations   $ (40)