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Supplementary Information Foreign Currency Exchange Gain (Loss) (Details) - USD ($) $ in Millions | 1 Months Ended | 2 Months Ended | 3 Months Ended | 8 Months Ended | 9 Months Ended
--- | --- | --- | --- | --- | ---
Sep. 30, 2017 | Aug. 31, 2017 | Sep. 30, 2018 | Aug. 31, 2017 | Sep. 30, 2018
Successor [Member] |  |  |  |  |  |  |
Foreign Currency Exchange Gain (Loss) [Line Items] |  |  |  |  |  |  |
Foreign Currency Transaction Gain (Loss), before Tax | $ 77 |  | $ (77) |  |  | $ (186) |
Foreign Currency Transaction Gain (Loss) Tax (Expense) Benefit | (71) |  | 26 |  |  | 51 |
Foreign Currency Transaction Gain (Loss) After Tax | 6 |  | (51) |  |  | (135) |
Predecessor [Member] |  |  |  |  |  |  |
Foreign Currency Exchange Gain (Loss) [Line Items] |  |  |  |  |  |  |
Foreign Currency Transaction Gain (Loss), before Tax |  | $ (195) |  |  | $ (394) |  |
Foreign Currency Transaction Gain (Loss) Tax (Expense) Benefit |  | 182 |  |  | 372 |  |
Foreign Currency Transaction Gain (Loss) After Tax |  | (13) |  |  | (22) |  |
Subsidiary Monetary Position | Successor [Member] |  |  |  |  |  |  |
Foreign Currency Exchange Gain (Loss) [Line Items] |  |  |  |  |  |  |
Foreign Currency Transaction Gain (Loss), before Tax | (35) |  | (108) | [1] |  | (213) | [1]
Foreign Currency Transaction Gain (Loss) Tax (Expense) Benefit | (31) |  | 33 |  |  | 57 |
Foreign Currency Transaction Gain (Loss) After Tax | (66) |  | (75) |  |  | (156) |
Subsidiary Monetary Position | Predecessor [Member] |  |  |  |  |  |  |
Foreign Currency Exchange Gain (Loss) [Line Items] |  |  |  |  |  |  |
Foreign Currency Transaction Gain (Loss), before Tax |  | 65 |  |  | 37 |  |
Foreign Currency Transaction Gain (Loss) Tax (Expense) Benefit |  | 88 |  |  | 217 |  |
Foreign Currency Transaction Gain (Loss) After Tax |  | 153 |  |  | 254 |  |
Hedging Program [Member] | Successor [Member] |  |  |  |  |  |  |
Foreign Currency Exchange Gain (Loss) [Line Items] |  |  |  |  |  |  |
Foreign Currency Transaction Gain (Loss), before Tax | 112 |  | 31 |  |  | 27 | [2]
Foreign Currency Transaction Gain (Loss) Tax (Expense) Benefit | (40) |  | (7) |  |  | (6) |
Foreign Currency Transaction Gain (Loss) After Tax | $ 72 |  | 24 |  |  | 21 |
Hedging Program [Member] | Predecessor [Member] |  |  |  |  |  |  |
Foreign Currency Exchange Gain (Loss) [Line Items] |  |  |  |  |  |  |
Foreign Currency Transaction Gain (Loss), before Tax |  | (260) |  |  | (431) |  |
Foreign Currency Transaction Gain (Loss) Tax (Expense) Benefit |  | 94 |  |  | 155 |  |
Foreign Currency Transaction Gain (Loss) After Tax |  | $ (166) |  |  | $ (276) |  |
Brazil Valuation Allowance [Member] | Hedging Program [Member] | Successor [Member] |  |  |  |  |  |  |
Foreign Currency Exchange Gain (Loss) [Line Items] |  |  |  |  |  |  |
Foreign Currency Transaction Gain (Loss), before Tax |  |  | $ 44 |  |  |  |
Tax Reform Foreign Currency Exchange Impact [Member] | Hedging Program [Member] | Successor [Member] |  |  |  |  |  |  |
Foreign Currency Exchange Gain (Loss) [Line Items] |  |  |  |  |  |  |
Foreign Currency Transaction Gain (Loss), before Tax |  |  |  |  |  | 50 |
Argentina, Pesos | Hedging Program [Member] | Successor [Member] |  |  |  |  |  |  |
Foreign Currency Exchange Gain (Loss) [Line Items] |  |  |  |  |  |  |
Foreign Currency Transaction Gain (Loss), before Tax |  |  |  |  |  | $ 80 |
[1] | Includes a net $44 million and $80 million pre-tax exchange loss associated with the devaluation of the Argentine peso for the three and nine months ended September 30, 2018, respectively.
[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.

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