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Supplementary Information Foreign Currency Exchange Gain (Loss) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Successor [Member] |  |  |  |  |
Foreign Currency Exchange Gain (Loss) [Line Items] |  |  |  |  |
Foreign Currency Transaction Gain (Loss), before Tax | $ 23 |  | $ (109) |  |
Foreign Currency Transaction Gain (Loss) Tax (Expense) Benefit | (49) |  | 25 |  |
Foreign Currency Transaction Gain (Loss) After Tax | (26) |  | (84) |  |
Predecessor [Member] |  |  |  |  |
Foreign Currency Exchange Gain (Loss) [Line Items] |  |  |  |  |
Foreign Currency Transaction Gain (Loss), before Tax |  | $ (140) |  |  | $ (199)
Foreign Currency Transaction Gain (Loss) Tax (Expense) Benefit |  | 125 |  |  | 191
Foreign Currency Transaction Gain (Loss) After Tax |  | (15) |  |  | (8)
Subsidiary Monetary Position | Successor [Member] |  |  |  |  |
Foreign Currency Exchange Gain (Loss) [Line Items] |  |  |  |  |
Foreign Currency Transaction Gain (Loss), before Tax | (154) |  | (105) |  |
Foreign Currency Transaction Gain (Loss) Tax (Expense) Benefit | (8) |  | 24 |  |
Foreign Currency Transaction Gain (Loss) After Tax | (162) |  | (81) |  |
Subsidiary Monetary Position | Predecessor [Member] |  |  |  |  |
Foreign Currency Exchange Gain (Loss) [Line Items] |  |  |  |  |
Foreign Currency Transaction Gain (Loss), before Tax |  | (54) |  |  | (28)
Foreign Currency Transaction Gain (Loss) Tax (Expense) Benefit |  | 94 |  |  | 130
Foreign Currency Transaction Gain (Loss) After Tax |  | 40 |  |  | 102
Hedging Program [Member] | Successor [Member] |  |  |  |  |
Foreign Currency Exchange Gain (Loss) [Line Items] |  |  |  |  |
Foreign Currency Transaction Gain (Loss), before Tax | 177 |  | (4) | [1] |
Foreign Currency Transaction Gain (Loss) Tax (Expense) Benefit | (41) |  | 1 |  |
Foreign Currency Transaction Gain (Loss) After Tax | $ 136 |  | (3) |  |
Hedging Program [Member] | Predecessor [Member] |  |  |  |  |
Foreign Currency Exchange Gain (Loss) [Line Items] |  |  |  |  |
Foreign Currency Transaction Gain (Loss), before Tax |  | (86) |  |  | (171)
Foreign Currency Transaction Gain (Loss) Tax (Expense) Benefit |  | 31 |  |  | 61
Foreign Currency Transaction Gain (Loss) After Tax |  | $ (55) |  |  | $ (110)
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) |  |
[1] | Includes a $(50) million foreign exchange loss for the six months ended June 30, 2018 related to adjustments to foreign currency exchange contracts as a result of U.S. tax reform.

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- Definition Amount before tax of foreign currency transaction realized and unrealized gain (loss) recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450222&loc=d3e30840-110895 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64836518&loc=d3e30700-110894 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=64836518&loc=d3e30690-110894 + Details
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