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Financial structure and financial costs - Interest rate risk sensitivity (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Sensitivity analysis      
Financial liabilities $ (107,735) $ (93,333) $ (89,295)
Financial assets 70,341 67,768 72,163
Fair value, financial liabilities (110,883) (94,485) (90,840)
Fair value, financial assets 70,341 67,768 72,163
Impact of changes in interest rates on the cost of net debt      
Cost of net debt (2,352) (2,121) (1,534)
Current portion of non-current debt after swap (excluding lease obligations)      
Sensitivity analysis      
Financial liabilities (5,331) (5,027) (4,646)
Fair value, financial liabilities (5,332) (5,027) (4,645)
Held for trading - Other interest rate swaps      
Sensitivity analysis      
Carrying amount (7) (37) 76
Estimated fair value (7) (37) 76
Held for trading - Currency swaps and forward exchange contracts      
Sensitivity analysis      
Carrying amount 89 (34) 142
Estimated fair value 89 (34) 142
Due after 12 months | Bonds (before swaps)      
Sensitivity analysis      
Financial liabilities (38,657) (34,975) (36,613)
Fair value, financial liabilities (41,805) (36,127) (38,159)
Due after 12 months | Swaps hedging bonds      
Sensitivity analysis      
Financial liabilities (1,694) (1,880) (1,082)
Financial assets 512 613 606
Carrying amount (1,182) (1,267) (476)
Fair value, financial liabilities (1,694) (1,880) (1,082)
Fair value, financial assets 512 613 606
Estimated fair value $ (1,182) $ (1,267) $ (476)
Interest rate risk      
Sensitivity analysis      
Reasonably possible increase in risk assumption (as a percent) 0.10% 0.10% 0.10%
Reasonably possible decrease in risk assumption (as a percent) 0.10% 0.10% 0.10%
Impact of changes in interest rates on the cost of net debt      
Impact on cost of net debt, interest rate increase $ 27 $ 29 $ 29
Impact on cost of net debt, interest rate decrease (27) (29) (29)
Interest rate risk | Current portion of non-current debt after swap (excluding lease obligations)      
Sensitivity analysis      
Change in fair value due to interest rate increase 1   1
Change in fair value due to interest rate decrease (1)   (1)
Interest rate risk | Held for trading - Other interest rate swaps      
Sensitivity analysis      
Change in fair value due to interest rate increase 18 12 12
Change in fair value due to interest rate decrease (18) (12) (12)
Interest rate risk | Due after 12 months | Bonds (before swaps)      
Sensitivity analysis      
Change in fair value due to interest rate increase 247 185 191
Change in fair value due to interest rate decrease (247) (185) (191)
Interest rate risk | Due after 12 months | Swaps hedging bonds      
Sensitivity analysis      
Change in fair value due to interest rate increase (44) (59) (83)
Change in fair value due to interest rate decrease $ 44 $ 59 $ 83