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Accumulated Other Comprehensive Income (Loss) (Income (Expense) Effect of Reclassifications) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Affected Line Item on the Statements of Income [Line Items]    
Wholesale energy $ 800 $ 676
Fuel and energy purchases (491) (515)
Other Income (Expense) - net 6 7
Total Pre-tax 257 149
Income Taxes (106) (53)
Reclassification out of AOCI    
Affected Line Item on the Statements of Income [Line Items]    
Income (Loss) from Continuing Operations After Income Taxes (1) 1
Reclassification out of AOCI | Available-for-sale securities    
Affected Line Item on the Statements of Income [Line Items]    
Other Income (Expense) - net (2) 2
Income Taxes 1 (1)
Income (Loss) from Continuing Operations After Income Taxes (1) 1
Reclassification out of AOCI | Qualifying derivatives    
Affected Line Item on the Statements of Income [Line Items]    
Total Pre-tax 5 7
Income Taxes (2) (3)
Income (Loss) from Continuing Operations After Income Taxes 3 4
Reclassification out of AOCI | Qualifying derivatives | Commodity contracts    
Affected Line Item on the Statements of Income [Line Items]    
Wholesale energy (3) (2)
Fuel and energy purchases 8 8
Other Income (Expense) - net 0 1
Reclassification out of AOCI | Defined benefit plans    
Affected Line Item on the Statements of Income [Line Items]    
Total Pre-tax (5) (7)
Income Taxes 2 3
Income (Loss) from Continuing Operations After Income Taxes (3) (4)
Reclassification out of AOCI | Defined benefit plans | Net actuarial loss    
Affected Line Item on the Statements of Income [Line Items]    
Total Pre-tax $ (5) $ (7)