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Income Taxes - Allocation of Income Tax Benefit/(Provision)(Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Income tax benefit/(provision) applicable to:          
Income/(loss) from continuing operations $ (72) $ (7) $ (27) $ 119 $ 596
Discontinued operations, before income taxes $ 0 $ (33) (730) (64) (32)
Accumulated other comprehensive income/(loss)     0 0 (16)
Deconsolidation and restructuring of CEOC and other     0 1,176 0
Additional paid-in capital     $ 0 $ 0 $ (15)