Income Taxes - Income Tax Allocation (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Income Tax Disclosure [Abstract]
Loss before income taxes		$ 0	$ (484)	$ (28)	$ (2,345)
Income tax benefit/(provision)	[1],[2]	$ 111	$ 45	$ 134	$ (34)
Effective tax rate			9.30%	478.60%	(1.40%)

[1] (1) Taxes are recorded at the consolidated level and not estimated or recorded to our Las Vegas and Other U.S. segments.

[2] (2) Taxes are recorded at the consolidated level and not estimated or recorded to our Las Vegas and Other U.S. segments.