Fair Value Disclosures - (Details) (USD $)	3 Months Ended	9 Months Ended
Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010	Dec. 31, 2010
Additional Fair Value Elements [Abstract]
Carrying amount of long term debt including current maturities	$ 12,940,000,000		$ 12,940,000,000		$ 12,642,000,000
Long-term Debt, Fair Value	15,100,000,000		15,100,000,000		14,000,000,000
Schedule Of Available For Sale Securities [Line Items]
Fair Value	1,564,000,000		1,564,000,000		1,587,000,000
Unrealized Losses	45,000,000		45,000,000		19,000,000
Unrealized Gains	352,000,000		352,000,000		439,000,000
Aggregate fair value of investments related to unrealized losses
Aggregate fair value of investments related to unrealized losses	266,000,000		266,000,000		195,000,000
Fair value of available for sale debt securities by contractual maturity
Due in one year or less	35,000,000		35,000,000
Due after one through five years	212,000,000		212,000,000
Due after five through 10 years	127,000,000		127,000,000
Due after 10 years	140,000,000		140,000,000
Total	514,000,000		514,000,000
Sales of available for sale securities
Proceeds	1,062,000,000	2,051,000,000	4,254,000,000	5,743,000,000
Realized gains	9,000,000	7,000,000	24,000,000	17,000,000
Realized losses	11,000,000	5,000,000	20,000,000	20,000,000
Nuclear decommissioning trust funds
Common stock equity	925,000,000		925,000,000		1,021,000,000
Preferred stock and other equity	50,000,000		50,000,000		28,000,000
Corporate debt	90,000,000		90,000,000		86,000,000
U.S. state and municipal debt	119,000,000		119,000,000		132,000,000
U.S. and foreign government debt	288,000,000		288,000,000		261,000,000
Money market funds and other	40,000,000		40,000,000		43,000,000
Total nuclear decommissioning trust funds	1,512,000,000		1,512,000,000		1,571,000,000
Derivatives
Commodity forward contracts	7,000,000		7,000,000		15,000,000
Interest rate contracts					4,000,000
Other marketable securities
Corporate debt					4,000,000
U.S. and foreign government debt					3,000,000
Money market and other	25,000,000		25,000,000		18,000,000
Total assets	1,544,000,000		1,544,000,000		1,615,000,000
Derivatives
Commodity forward contracts	469,000,000		469,000,000		494,000,000
Interest rate contracts	86,000,000		86,000,000		39,000,000
Contingent value obligations derivatives	74,000,000		74,000,000		15,000,000
Total liabilities	629,000,000		629,000,000		548,000,000
Fair value hierarchy
Derivatives, net at beginning of period	37,000,000	62,000,000	36,000,000	39,000,000
Deferred as regulatory assets and liabilities, net	6,000,000	23,000,000	7,000,000	46,000,000
Transfers (in) out of level 3, net	74,000,000	0	74,000,000	0
Derivatives, net at end of period	117,000,000	85,000,000	117,000,000	85,000,000
Common stock equity
Schedule Of Available For Sale Securities [Line Items]
Fair Value	925,000,000		925,000,000		1,021,000,000
Unrealized Losses	41,000,000		41,000,000		13,000,000
Unrealized Gains	313,000,000		313,000,000		408,000,000
Preferred stock and other equity
Schedule Of Available For Sale Securities [Line Items]
Fair Value	50,000,000		50,000,000		28,000,000
Unrealized Losses	1,000,000		1,000,000		0
Unrealized Gains	8,000,000		8,000,000		11,000,000
Corporate debt
Schedule Of Available For Sale Securities [Line Items]
Fair Value	90,000,000		90,000,000		90,000,000
Unrealized Losses	1,000,000		1,000,000		0
Unrealized Gains	6,000,000		6,000,000		6,000,000
U.S. state and municipal debt
Schedule Of Available For Sale Securities [Line Items]
Fair Value	121,000,000		121,000,000		132,000,000
Unrealized Losses	2,000,000		2,000,000		4,000,000
Unrealized Gains	6,000,000		6,000,000		3,000,000
U.S. and foreign government debt
Schedule Of Available For Sale Securities [Line Items]
Fair Value	289,000,000		289,000,000		264,000,000
Unrealized Losses	0		0		2,000,000
Unrealized Gains	17,000,000		17,000,000		10,000,000
Money market funds and other
Schedule Of Available For Sale Securities [Line Items]
Fair Value	89,000,000		89,000,000		52,000,000
Unrealized Losses	0		0		0
Unrealized Gains	2,000,000		2,000,000		1,000,000
Level 1
Nuclear decommissioning trust funds
Common stock equity	925,000,000		925,000,000		1,021,000,000
Preferred stock and other equity	23,000,000		23,000,000		22,000,000
Corporate debt	0		0		0
U.S. state and municipal debt	1,000,000		1,000,000		0
U.S. and foreign government debt	100,000,000		100,000,000		79,000,000
Money market funds and other	0		0		1,000,000
Total nuclear decommissioning trust funds	1,049,000,000		1,049,000,000		1,123,000,000
Derivatives
Commodity forward contracts	0		0		0
Interest rate contracts					0
Other marketable securities
Corporate debt					0
U.S. and foreign government debt					0
Money market and other	18,000,000		18,000,000		18,000,000
Total assets	1,067,000,000		1,067,000,000		1,141,000,000
Derivatives
Commodity forward contracts	0		0		0
Interest rate contracts	0		0		0
Contingent value obligations derivatives	0		0		0
Total liabilities	0		0		0
Level 2
Nuclear decommissioning trust funds
Common stock equity	0		0		0
Preferred stock and other equity	27,000,000		27,000,000		6,000,000
Corporate debt	90,000,000		90,000,000		86,000,000
U.S. state and municipal debt	118,000,000		118,000,000		132,000,000
U.S. and foreign government debt	188,000,000		188,000,000		182,000,000
Money market funds and other	40,000,000		40,000,000		42,000,000
Total nuclear decommissioning trust funds	463,000,000		463,000,000		448,000,000
Derivatives
Commodity forward contracts	7,000,000		7,000,000		15,000,000
Interest rate contracts					4,000,000
Other marketable securities
Corporate debt					4,000,000
U.S. and foreign government debt					3,000,000
Money market and other	7,000,000		7,000,000		0
Total assets	477,000,000		477,000,000		474,000,000
Derivatives
Commodity forward contracts	426,000,000		426,000,000		458,000,000
Interest rate contracts	86,000,000		86,000,000		39,000,000
Contingent value obligations derivatives	0		0		15,000,000
Total liabilities	512,000,000		512,000,000		512,000,000
Level 3
Nuclear decommissioning trust funds
Common stock equity	0		0		0
Preferred stock and other equity	0		0		0
Corporate debt	0		0		0
U.S. state and municipal debt	0		0		0
U.S. and foreign government debt	0		0		0
Money market funds and other	0		0		0
Total nuclear decommissioning trust funds	0		0		0
Derivatives
Commodity forward contracts	0		0		0
Interest rate contracts					0
Other marketable securities
Corporate debt					0
U.S. and foreign government debt					0
Money market and other	0		0		0
Total assets	0		0		0
Derivatives
Commodity forward contracts	43,000,000		43,000,000		36,000,000
Interest rate contracts	0		0		0
Contingent value obligations derivatives	74,000,000		74,000,000		0
Total liabilities	$ 117,000,000		$ 117,000,000		$ 36,000,000

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