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CONDENSED STATEMENTS OF CONSOLIDATED COMPREHENSIVE INCOME (Unaudited) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Statement of Comprehensive Income [Abstract]        
Net income (loss) $ 135 $ (2) $ 327 $ 152
Other comprehensive income (loss):        
Adjustment related to pension and other postretirement plans (net of tax of $1, $2, $2 and $1) 1 (1) 2 0
Net deferred loss from cash flow hedges (net of tax of $0, $1, $0 and $1) 0 (1) (1) (1)
Total 1 (2) 1 (1)
Comprehensive income (loss) $ 136 $ (4) $ 328 $ 151