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Supplementary Information Foreign Currency Exchange Gain (Loss) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Foreign Currency Exchange Gain (Loss) [Line Items]        
Pre-tax exchange (losses) gains - net [1] $ (14) $ 1 $ (49) $ (60)
Foreign Currency Transaction (Loss) Gain Tax (Expense) Benefit (1) 2 (6) (15)
Foreign Currency Transaction (Loss) Gain After Tax (15) 3 (55) (75)
Subsidiary Monetary Position        
Foreign Currency Exchange Gain (Loss) [Line Items]        
Pre-tax exchange (losses) gains - net 36 (13) (15) (239)
Foreign Currency Transaction (Loss) Gain Tax (Expense) Benefit (13) 5 (14) 28
Foreign Currency Transaction (Loss) Gain After Tax 23 (8) (29) (211)
Hedging Program [Member]        
Foreign Currency Exchange Gain (Loss) [Line Items]        
Pre-tax exchange (losses) gains - net (50) 14 (34) 179
Foreign Currency Transaction (Loss) Gain Tax (Expense) Benefit 12 (3) 8 (43)
Foreign Currency Transaction (Loss) Gain After Tax $ (38) $ 11 $ (26) $ 136
[1] Includes net pre-tax exchange losses of $14 million and $37 million associated with the devaluation of the Argentine peso for the three and six months ended June 30, 2021, respectively, and $22 million and $31 million for the three and six months ended June 30, 2020, respectively.