Equity Affiliates - Additional Information (Details) - USD ($) $ in Millions		3 Months Ended	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Schedule of Equity Method Investments [Line Items]
Dividends received from equity affiliates			$ 16	$ 16	$ 10
Equity method investments exceeding minimum value	$ 148	$ 148	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	$ 29	29	29
Minimum [Member]
Schedule of Equity Method Investments [Line Items]
Equity method investments exceeding minimum value	5	5	5
Goodwill [Member]
Schedule of Equity Method Investments [Line Items]
Equity method investment carrying amount over the book value	$ 19	$ 19	$ 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