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Condensed Statements Of Consolidated Income (Loss) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Income Statement [Abstract]        
Operating revenues $ 1,893 $ 1,752 $ 4,572 $ 4,358
Fuel, purchased power costs and delivery fees (852) (850) (2,175) (2,153)
Net gain (loss) from commodity hedging and trading activities 58 (3) 29 229
Operating costs (189) (201) (685) (636)
Depreciation and amortization (331) (328) (1,012) (992)
Selling, general and administrative expenses (175) (174) (502) (484)
Franchise and revenue-based taxes (18) (19) (51) (55)
Other income (Note 12) 1 2 7 12
Other deductions (Note 12) (8) (30) (12) (37)
Interest income 1 10 5 36
Interest expense and related charges (Note 12) (340) (772) (1,338) (2,268)
Income (loss) before income taxes 40 (613) (1,162) (1,990)
Income tax benefit 17 228 476 692
Net income (loss) $ 57 $ (385) $ (686) $ (1,298)