Income Taxes - Schedule of Components of Pretax (Loss) Income, (Benefit) Provision for Income Taxes and Effective Income Tax Rate (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Components of pretax (loss) income:
Domestic	$ (1,332)	$ (378)	$ (843)
Foreign	165	195	173
Total pretax (loss) income	(1,167)	(183)	(670)
Provision for income taxes:
Federal	7	16	39
State and local	14	22	20
Foreign	80	44	46
Income tax expense (benefit)	$ 101	$ 82	$ 105
Effective income tax rate	(9.00%)	(45.00%)	(16.00%)