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Accounting Principles and Practices - Schedule of Changes in Accounting Principle (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Operating income | $ 262 | $ 256 | $ 1,045 | $ 464
Other income (expense) | $ 1 | 4 | $ (17) | 6
As Reported |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Operating income |  | 265 |  | 490
Other income (expense) |  | (5) |  | (20)
Adjustments | Accounting Standards Update 2017-07 |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Operating income |  | (9) |  | (26)
Other income (expense) |  | $ 9 |  | $ 26

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