Equity Affiliates - Additional Information (Details) - USD ($) $ in Millions		3 Months Ended	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Schedule of Equity Method Investments [Line Items]
Dividends received from equity affiliates			$ 11	$ 16	$ 16
Equity method investments exceeding minimum value			148
Discount rate used in assessment of fair value	16.00%
Impairment of equity affiliate		$ 39		$ 39
Equity method investment carrying amount over the book value			27
Minimum [Member]
Schedule of Equity Method Investments [Line Items]
Equity method investments exceeding minimum value			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