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Summary of Significant Accounting Policies - Recent Accounting Pronouncements (Details) - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Jan. 01, 2018 | Dec. 31, 2014
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Increase in investments in unconsolidated entities | $ 2,756 | $ 2,343 | $ 2,027 |  |
Increase in partners' capital | 10,958 | 8,816 | 7,939 |  | $ 8,191
Cash outflow reclassed from operating activities | 2,499 | 733 | 1,358 |  |
Cash outflow reclassed to financing activities | $ 943 | (556) | (800) |  |
ASU 2016-09 |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Cash outflow reclassed from operating activities |  | 7 | 14 |  |
Cash outflow reclassed to financing activities |  | $ 7 | $ 14 |  |
Subsequent Event | ASU 2017-05 |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Increase in investments in unconsolidated entities |  |  |  | $ 110 |
Increase in partners' capital |  |  |  | $ 110 |

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