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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 $ 54 $ 6 $ 201 $ 126
Other comprehensive income, net of tax:        
Adjustment to pension and other postretirement plans (net of tax of $-0-, $1, $-0- and $1) 0 1 0 1
Other comprehensive income 0 1 0 1
Comprehensive income $ 54 $ 7 $ 201 $ 127