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Accounting Principles and Practices - Schedule of Changes in Accounting Principle (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Operating income | $ (16) | $ (127) | $ 783 | $ 208
Other income (expense) | $ (3) | 4 | $ (18) | 2
As Reported |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Operating income |  | (118) |  | 225
Other income (expense) |  | (5) |  | (15)
Adjustments | Accounting Standards Update 2017-07 |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Operating income |  | (9) |  | (17)
Other income (expense) |  | $ 9 |  | $ 17

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