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Condensed Statements of Consolidated Comprehensive Income (Unaudited) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Net income $ 126 $ 119 $ 273 $ 267
Other comprehensive income:        
Adjustment related to pension and other postretirement plans (net of tax of $1, $2, $3 and $4) 3 3 5 5
Total 3 3 5 5
Comprehensive income $ 129 $ 122 $ 278 $ 272