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Income Taxes - Allocation of Income Tax Benefit/(Provision) (Details) - USD ($)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income tax benefit/(provision) applicable to:      
Income/(loss) from continuing operations $ 1,995,000,000 $ (327,000,000) $ 106,000,000
Discontinued operations 0 (730,000,000) (64,000,000)
Deconsolidation and restructuring of CEOC and other $ 0 $ 0 $ 1,176,000,000