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Summary of Significant Accounting Policies - Recent Accounting Pronouncements (Details) - USD ($) $ in Millions | Jan. 01, 2019 | Dec. 31, 2018 | Jan. 01, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | --- | --- | ---
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Cumulative effect on investments in unconsolidated entities |  | $ 2,702 |  | $ 2,756 | $ 2,343
ASU 2017-05 |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Cumulative effect on investments in unconsolidated entities |  |  | $ 113 |  |
Cumulative effect on retained earnings |  |  | $ 113 | $ 113 |
Forecast | Subsequent Event | Minimum | ASU 2016-02 |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
ROU asset | $ 550 |  |  |  |
Lease liabilities | 550 |  |  |  |
Forecast | Subsequent Event | Maximum | ASU 2016-02 |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
ROU asset | 600 |  |  |  |
Lease liabilities | $ 600 |  |  |  |

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