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Equity (Accumulated Other Comprehensive Income) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Partners' Capital Notes [Abstract]    
Unrealized gains on available-for-sale securities [1] $ 2 $ 8
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax (5) (5)
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, after Tax (48) (5)
AOCI attributable to equity method investments 9 5
AOCI Including Portion Attributable to Noncontrolling Interest, Tax (42) 3
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest 0 3
Total AOCI included in partners' capital, net of tax $ (42) $ 0
[1] Effective January 1, 2018, the Partnership adopted Accounting Standards Update No. 2016-01, Recognition and Measurement of Financial Assets and Financial Liabilities, which resulted in the reclassification of $2 million from accumulated other comprehensive income related to available-for-sale equity securities to common unitholders.