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Shareholders' equity and share-based payments - Tax effects of other comprehensive income (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Pre-tax amount      
Actuarial gains and losses $ (212) $ (192) $ (12)
Change in fair value of investments in equity instruments 533 142  
Currency translation adjustment generated by the parent company 7,541 (1,533) (4,022)
SUB-TOTAL ITEMS NOT POTENTIALLY RECLASSIFIABLE TO PROFIT & LOSS 7,862 (1,583) (4,034)
Currency translation adjustment (4,645) 740 1,113
Cash flow hedge (313) (599) 25
Variation of foreign currency basis spread 28 1 (80)
Share of other comprehensive income of equity affiliates, net amount (1,831) 408 (540)
Other (8) (3) (5)
SUB-TOTAL ITEMS POTENTIALLY RECLASSIFIABLE TO PROFIT & LOSS (6,769) 547 513
TOTAL OTHER COMPREHENSIVE INCOME 1,093 (1,036) (3,521)
Tax effect      
Actuarial gains and losses 47 55 13
Change in fair value of investments in equity instruments 18 (2)  
SUB-TOTAL ITEMS NOT POTENTIALLY RECLASSIFIABLE TO PROFIT & LOSS 65 53 13
Cash flow hedge 79 202 (6)
Variation of foreign currency basis spread (7)   20
SUB-TOTAL ITEMS POTENTIALLY RECLASSIFIABLE TO PROFIT & LOSS 72 202 14
TOTAL OTHER COMPREHENSIVE INCOME 137 255 27
Net amount      
Actuarial gains and losses (165) (137) 1
Change in fair value of investments in equity instruments 551 140  
Currency translation adjustment generated by the parent company 7,541 (1,533) (4,022)
ITEMS NOT POTENTIALLY RECLASSIFIABLE TO PROFIT AND LOSS 7,927 (1,530) (4,021)
Currency translation adjustment (4,645) 740 1,113
Cash flow hedge (234) (397) 19
Variation of foreign currency basis spread 21 1 (60)
Share of other comprehensive income of equity affiliates, net amount (1,831) 408 (540)
Other (8) (3) (5)
ITEMS POTENTIALLY RECLASSIFIABLE TO PROFIT AND LOSS (6,697) 749 527
TOTAL OTHER COMPREHENSIVE INCOME (NET AMOUNT) $ 1,230 $ (781) $ (3,494)