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Investment in Unconsolidated Entities - Additional Information (Details) - USD ($) | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2018 | Jan. 01, 2018 | Dec. 31, 2017
Equity Securities without Readily Determinable Fair Value [Line Items] |  |  |  |
Cumulative effect of accounting changes |  |  |  | $ 193,000,000
Measurement alternative, impairment | $ 0 | $ 0 |  |
Measurement alternative, observable price change | $ 0 | $ 0 |  |
Retained earnings |  |  |  |
Equity Securities without Readily Determinable Fair Value [Line Items] |  |  |  |
Cumulative effect of accounting changes |  |  |  | $ 163,000,000
ASU 2016-01 | Retained earnings |  |  |  |
Equity Securities without Readily Determinable Fair Value [Line Items] |  |  |  |
Cumulative effect of accounting changes |  |  | $ 1,000,000 |

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