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Supplementary Information Foreign Currency Exchange Gain (Loss) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Foreign Currency Exchange Gain (Loss) [Line Items] |  |  |  |  |  |
Exchange gains (losses) - net | [1] | $ (11) | $ (74) | $ (70) | $ (190) | [2]
Foreign Currency Transaction Gain (Loss) Tax (Expense) Benefit |  | (12) | 0 | 0 | 26 |
Foreign Currency Transaction Gain (Loss) After Tax |  | (23) | (74) | (70) | (164) |
Subsidiary Monetary Position |  |  |  |  |  |
Foreign Currency Exchange Gain (Loss) [Line Items] |  |  |  |  |  |
Exchange gains (losses) - net | [3] | (66) | (105) | (59) | (217) |
Foreign Currency Transaction Gain (Loss) Tax (Expense) Benefit |  | 1 | 7 | (2) | 32 |
Foreign Currency Transaction Gain (Loss) After Tax |  | (65) | (98) | (61) | (185) |
Hedging Program [Member] |  |  |  |  |  |
Foreign Currency Exchange Gain (Loss) [Line Items] |  |  |  |  |  |
Exchange gains (losses) - net |  | 55 | 31 | (11) | 27 | [4]
Foreign Currency Transaction Gain (Loss) Tax (Expense) Benefit |  | (13) | (7) | 2 | (6) |
Foreign Currency Transaction Gain (Loss) After Tax |  | 42 | 24 | (9) | 21 |
Argentine peso devaluation [Member] | Hedging Program [Member] |  |  |  |  |  |
Foreign Currency Exchange Gain (Loss) [Line Items] |  |  |  |  |  |
Exchange gains (losses) - net |  | $ (42) | $ (40) | $ (33) | (73) |
Tax Reform Foreign Currency Exchange Impact [Member] | Hedging Program [Member] |  |  |  |  |  |
Foreign Currency Exchange Gain (Loss) [Line Items] |  |  |  |  |  |
Exchange gains (losses) - net |  |  |  |  | $ (50) |
[1] | Includes net pre-tax exchange losses of $(33) million and $(42) million for the three and nine months ended September 30, 2019, respectively and $(40) million and $(73) million for the three and nine months ended September 30, 2018, respectively, associated with the devaluation of the Argentine peso.
[2] | Includes a $(50) million foreign exchange loss for the nine months ended September 30, 2018 related to adjustments to foreign currency exchange contracts as a result of U.S. tax reform, which is included within significant items.
[3] | Includes net pre-tax exchange losses of $(33) million and $(42) million for the three and nine months ended September 30, 2019, respectively and $(40) million and $(73) million for the three and nine months ended September 30, 2018, respectively, associated with the devaluation of the Argentine peso.
[4] | Includes a $(50) million foreign exchange loss for the nine months ended September 30, 2018 related to adjustments to foreign currency exchange contracts as a result of U.S. tax reform.

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