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Other Income (Expense) - net (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Other Income [Line Items] |  |  |
Economic foreign currency exchange contracts | $ (261) | $ 384 | $ 122
Interest income | 2 | 3 | 4
Allowance for funds used during construction - equity component | 16 | 19 | 14
Miscellaneous | 17 | 6 | 6
Total Other Income | (226) | 412 | 146
Other Expense [Line Items] |  |  |
Charitable contributions | 8 | 9 | 21
Miscellaneous | 21 | 13 | 17
Total Other Expense | 29 | 22 | 38
Other Income (Expense) - net | $ (255) | $ 390 | $ 108

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