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Basis of Presentation and Significant Accounting Policies - Recast of Financial Information Due to Adoption of New Accounting Guidance (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Increase (decrease) in cash provided by operating activities | $ (1,102) | $ (785) | $ (622)
Decrease in cash used by investing activities | 400 | 386 | (142)
Accounting Standards Update 2017-07 |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Net periodic pension income included in other expense (income) | $ (72) | (42) | (24)
Accounting Standards Update 2016-18 |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Increase (decrease) in cash provided by operating activities |  | 14 | $ 3
Decrease in cash used by investing activities |  | $ 39 |

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