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Equity Affiliates - Additional Information (Details) - USD ($) $ in Millions |  | 12 Months Ended
--- | --- | ---
Dec. 31, 2015 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Schedule of Equity Method Investments [Line Items] |  |  |  |
Dividends received from equity affiliates |  | $ 16 | $ 11 | $ 16
Equity method investments |  | 160 |  |
Discount rate used in assessment of fair value | 16.00% |  |  |
Impairment of equity affiliate |  |  |  | $ 39
Equity method investment carrying amount over the book value |  | 26 |  |
Minimum [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity method investments |  | 5 |  |
Goodwill [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity method investment carrying amount over the book value |  | $ 19 |  |
Other Than Goodwill [Member] | Minimum [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Estimated useful life |  | 5 years |  |
Other Than Goodwill [Member] | Maximum [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Estimated useful life |  | 45 years |  |

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