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Equity (Accumulated Other Comprehensive Income) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Partners' Capital Notes [Abstract]    
Unrealized gains on available-for-sale securities $ 2 $ 0
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax (5) (4)
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, Net of Tax 7 8
AOCI attributable to equity method investments 4 0
Subtotal 8 4
Amounts attributable to noncontrolling interest (8) (4)
Total AOCI included in partners' capital, net of tax $ 0 $ 0