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Income Tax Expense (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Income Tax Disclosure [Abstract]    
Tax at statutory federal rate $ (6) $ 22
Partnership earnings not subject to tax (10) (33)
State and local tax, net of federal benefit (1) 11
Other 0 2
Net income tax expense (benefit) $ (17) $ 2