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Consolidated Statements Of Comprehensive Income - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Statement of Comprehensive Income [Abstract]    
Net income $ 489 $ 319
Other comprehensive income, net of tax:    
Change in value of available-for-sale securities (2) 2
Actuarial gain relating to pension and other postretirement benefit plans (2) (2)
Change in other comprehensive income from unconsolidated affiliates 5 0
Other comprehensive income (loss), net of tax 1 0
Comprehensive income 490 319
Less: Comprehensive income attributable to noncontrolling interest 127 80
Comprehensive income attributable to partners $ 363 $ 239