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, 2016	Dec. 31, 2015	Dec. 31, 2014
Components of pretax income (loss):
Domestic	$ 492	$ (1,332)	$ (378)
Foreign	249	165	195
Total pretax (loss) income	741	(1,167)	(183)
Provision for income taxes:
Federal	20	7	16
State and local	20	14	22
Foreign	41	80	44
Income tax expense	$ 81	$ 101	$ 82
Effective income tax rate (percent)	11.00%	(9.00%)	(45.00%)