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Other Income and Expenses (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Other income:        
Equity allowance for funds used during construction $ 23 $ 18 $ 71 $ 74
Increase in cash surrender value of life insurance policies 6 6 20 19
Other 7 2 12 10
Total other income 36 26 103 103
Other expenses:        
Civic, political and related activities and donations 5 6 22 21
Other 4 4 14 14
Total other expenses $ 9 $ 10 $ 36 $ 35