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Equity Table - Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Millions
6 Months Ended 12 Months Ended
Jun. 30, 2019
Dec. 31, 2018
Partners' Capital Notes [Abstract]    
Available-for-sale securities $ 10 $ 2
Foreign currency translation adjustment (5) (5)
Actuarial gain related to pensions and other postretirement benefits (38) (48)
AOCI attributable to equity method investments 0 9
Subtotal (33) (42)
Accumulated other comprehensive income, net $ (33) $ (42)