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Consolidated Statements Of Comprehensive Income - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Net income $ 2,366 $ 0 [1],[2] $ 1,061 [2]
Other comprehensive income (loss), net of tax:      
Change in value of available-for-sale securities 6 2 (3)
Actuarial gain (loss) relating to pension and other postretirement benefits (12) (1) 65
Foreign currency translation adjustment 0 (1) (1)
Change in other comprehensive income (loss) from unconsolidated affiliates 1 4 (1)
Other comprehensive income (loss), net of tax, total (5) 4 60
Comprehensive income 2,361 4 1,121
Less: Comprehensive income (loss) attributable to noncontrolling interest 1,407 (991) (68)
Comprehensive income attributable to partners $ 954 $ 995 $ 1,189
[1] * As adjusted. See Note 2 and Note 3.
[2] * As adjusted. See Note 2.