Fair Value (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Assets [Abstract]
Cash and Cash Equivalents, Fair Value Disclosure	$ 69	$ 140
Nuclear decommissioning trusts	1,029	937
Other investments	106	95
Derivative Assets [Abstract]
Derivative Asset, Fair Value, Gross Asset	1,444	2,805
Derivative Assets	1,390	1,468
Liabilities [Abstract]
Derivative Liability, Fair Value, Gross Liability	(1,435)	(2,811)
Derivative Liabilities	(176)	(247)
Derivative Assets and Liabilties [Abstract]
Derivative Assets (Liabilities), at Fair Value, Net	1,214	1,221
Derivative Assets, Current	123	222
Derivative Assets, Noncurrent	63	74
Derivative Liabilities, Current	146	158
Derivative Liabilities, Noncurrent	30	89
Current Asset [Member]
Derivative Assets and Liabilties [Abstract]
Derivative Assets, Current	192	362
Non Current Asset [Member]
Derivative Assets and Liabilties [Abstract]
Derivative Assets, Noncurrent	1,198	1,106
Current Liability [Member]
Derivative Assets and Liabilties [Abstract]
Derivative Liabilities, Current	(146)	(158)
Noncurrent Liability [Member]
Derivative Assets and Liabilties [Abstract]
Derivative Liabilities, Noncurrent	(30)	(89)
Foreign currency exchange contracts [Member]
Derivative Assets [Abstract]
Derivative Asset, Fair Value, Gross Asset	0	0
Liabilities [Abstract]
Derivative Liability, Fair Value, Gross Liability	(1)	(2)
Interest rate contracts [Member]
Liabilities [Abstract]
Derivative Liability, Fair Value, Gross Liability	(1)	(1)
Natural Gas [Member]
Derivative Assets [Abstract]
Derivative Asset, Fair Value, Gross Asset	41	33
Liabilities [Abstract]
Derivative Liability, Fair Value, Gross Liability	(56)	(104)
Electricity [Member]
Derivative Assets [Abstract]
Derivative Asset, Fair Value, Gross Asset	136	257
Liabilities [Abstract]
Derivative Liability, Fair Value, Gross Liability	(124)	(140)
Other Credit Derivatives [Member]
Derivative Assets [Abstract]
Derivative Asset, Fair Value, Gross Asset	9	6
Liabilities [Abstract]
Derivative Liability, Fair Value, Gross Liability	6	0
Total derivative assets [Member]
Derivative Assets [Abstract]
Derivative Assets	186	296
Total derivative liabilities [Member]
Liabilities [Abstract]
Derivative Liabilities	(176)	(247)
Fair Value, Inputs, Level 1 [Member]
Assets [Abstract]
Cash and Cash Equivalents, Fair Value Disclosure	0	0
Nuclear decommissioning trusts	651	577
Other investments	64	57
Derivative Assets [Abstract]
Derivative Assets	1,601	2,583
Liabilities [Abstract]
Derivative Liabilities	(860)	(1,959)
Derivative Assets and Liabilties [Abstract]
Derivative Assets (Liabilities), at Fair Value, Net	741	624
Derivative Assets, Current	698	1,571
Derivative Assets, Noncurrent	903	1,012
Derivative Liabilities, Current	(696)	(1,603)
Derivative Liabilities, Noncurrent	(164)	(356)
Fair Value, Inputs, Level 1 [Member] \| Foreign currency exchange contracts [Member]
Derivative Assets [Abstract]
Derivative Asset, Fair Value, Gross Asset	0	0
Liabilities [Abstract]
Derivative Liability, Fair Value, Gross Liability	0	0
Fair Value, Inputs, Level 1 [Member] \| Interest rate contracts [Member]
Liabilities [Abstract]
Derivative Liability, Fair Value, Gross Liability	0	0
Fair Value, Inputs, Level 1 [Member] \| Natural Gas [Member]
Derivative Assets [Abstract]
Derivative Asset, Fair Value, Gross Asset	845	1,926
Liabilities [Abstract]
Derivative Liability, Fair Value, Gross Liability	(824)	(1,940)
Fair Value, Inputs, Level 1 [Member] \| Electricity [Member]
Derivative Assets [Abstract]
Derivative Asset, Fair Value, Gross Asset	0	0
Liabilities [Abstract]
Derivative Liability, Fair Value, Gross Liability	0	0
Fair Value, Inputs, Level 1 [Member] \| Other Credit Derivatives [Member]
Derivative Assets [Abstract]
Derivative Asset, Fair Value, Gross Asset	41	23
Liabilities [Abstract]
Derivative Liability, Fair Value, Gross Liability	(36)	(19)
Fair Value, Inputs, Level 1 [Member] \| Total derivative assets [Member]
Derivative Assets [Abstract]
Derivative Assets	886	1,949
Fair Value, Inputs, Level 1 [Member] \| Total derivative liabilities [Member]
Liabilities [Abstract]
Derivative Liabilities	(860)	(1,959)
Fair Value, Inputs, Level 2 [Member]
Assets [Abstract]
Cash and Cash Equivalents, Fair Value Disclosure	69	140
Nuclear decommissioning trusts	378	360
Other investments	42	38
Derivative Assets [Abstract]
Derivative Assets	862	1,144
Liabilities [Abstract]
Derivative Liabilities	(376)	(646)
Derivative Assets and Liabilties [Abstract]
Derivative Assets (Liabilities), at Fair Value, Net	486	498
Derivative Assets, Current	387	660
Derivative Assets, Noncurrent	475	484
Derivative Liabilities, Current	(324)	(527)
Derivative Liabilities, Noncurrent	(52)	(119)
Fair Value, Inputs, Level 2 [Member] \| Foreign currency exchange contracts [Member]
Derivative Assets [Abstract]
Derivative Asset, Fair Value, Gross Asset	1	3
Liabilities [Abstract]
Derivative Liability, Fair Value, Gross Liability	(2)	(5)
Fair Value, Inputs, Level 2 [Member] \| Interest rate contracts [Member]
Liabilities [Abstract]
Derivative Liability, Fair Value, Gross Liability	(1)	(1)
Fair Value, Inputs, Level 2 [Member] \| Natural Gas [Member]
Derivative Assets [Abstract]
Derivative Asset, Fair Value, Gross Asset	94	78
Liabilities [Abstract]
Derivative Liability, Fair Value, Gross Liability	(87)	(126)
Fair Value, Inputs, Level 2 [Member] \| Electricity [Member]
Derivative Assets [Abstract]
Derivative Asset, Fair Value, Gross Asset	273	523
Liabilities [Abstract]
Derivative Liability, Fair Value, Gross Liability	(285)	(513)
Fair Value, Inputs, Level 2 [Member] \| Other Credit Derivatives [Member]
Derivative Assets [Abstract]
Derivative Asset, Fair Value, Gross Asset	5	2
Liabilities [Abstract]
Derivative Liability, Fair Value, Gross Liability	(1)	(1)
Fair Value, Inputs, Level 2 [Member] \| Total derivative assets [Member]
Derivative Assets [Abstract]
Derivative Assets	373	606
Fair Value, Inputs, Level 2 [Member] \| Total derivative liabilities [Member]
Liabilities [Abstract]
Derivative Liabilities	(376)	(646)
Fair Value, Inputs, Level 3 [Member]
Assets [Abstract]
Cash and Cash Equivalents, Fair Value Disclosure	0	0
Nuclear decommissioning trusts	0	0
Other investments	0	0
Derivative Assets [Abstract]
Derivative Assets	185	250
Liabilities [Abstract]
Derivative Liabilities	(199)	(206)
Derivative Assets and Liabilties [Abstract]
Derivative Assets (Liabilities), at Fair Value, Net	(14)	44
Derivative Assets, Current	145	181
Derivative Assets, Noncurrent	40	69
Derivative Liabilities, Current	(165)	(152)
Derivative Liabilities, Noncurrent	(34)	(54)
Fair Value, Inputs, Level 3 [Member] \| Foreign currency exchange contracts [Member]
Derivative Assets [Abstract]
Derivative Asset, Fair Value, Gross Asset	0	0
Liabilities [Abstract]
Derivative Liability, Fair Value, Gross Liability	0	0
Fair Value, Inputs, Level 3 [Member] \| Interest rate contracts [Member]
Liabilities [Abstract]
Derivative Liability, Fair Value, Gross Liability	0	0
Fair Value, Inputs, Level 3 [Member] \| Natural Gas [Member]
Derivative Assets [Abstract]
Derivative Asset, Fair Value, Gross Asset	20	20
Liabilities [Abstract]
Derivative Liability, Fair Value, Gross Liability	(64)	(14)
Fair Value, Inputs, Level 3 [Member] \| Electricity [Member]
Derivative Assets [Abstract]
Derivative Asset, Fair Value, Gross Asset	158	224
Liabilities [Abstract]
Derivative Liability, Fair Value, Gross Liability	(134)	(192)
Fair Value, Inputs, Level 3 [Member] \| Other Credit Derivatives [Member]
Derivative Assets [Abstract]
Derivative Asset, Fair Value, Gross Asset	7	6
Liabilities [Abstract]
Derivative Liability, Fair Value, Gross Liability	(1)	0
Fair Value, Inputs, Level 3 [Member] \| Total derivative assets [Member]
Derivative Assets [Abstract]
Derivative Assets	185	250
Fair Value, Inputs, Level 3 [Member] \| Total derivative liabilities [Member]
Liabilities [Abstract]
Derivative Liabilities	(199)	(206)
Netting Adjustments [Member]
Assets [Abstract]
Cash and Cash Equivalents, Fair Value Disclosure	0	0
Nuclear decommissioning trusts	0	0
Other investments	0	0
Derivative Assets [Abstract]
Derivative Assets	(1,258)	(2,509)
Liabilities [Abstract]
Derivative Liabilities	1,259	2,564
Derivative Assets and Liabilties [Abstract]
Derivative Assets (Liabilities), at Fair Value, Net	1	55
Derivative Assets, Current	(1,038)	(2,050)
Derivative Assets, Noncurrent	(220)	(459)
Derivative Liabilities, Current	1,039	2,124
Derivative Liabilities, Noncurrent	220	440
Netting Adjustments [Member] \| Foreign currency exchange contracts [Member]
Derivative Assets [Abstract]
Derivative Asset, Fair Value, Gross Asset	(1)	(3)
Liabilities [Abstract]
Derivative Liability, Fair Value, Gross Liability	1	3
Netting Adjustments [Member] \| Interest rate contracts [Member]
Liabilities [Abstract]
Derivative Liability, Fair Value, Gross Liability	0	0
Netting Adjustments [Member] \| Natural Gas [Member]
Derivative Assets [Abstract]
Derivative Asset, Fair Value, Gross Asset	(918)	(1,991)
Liabilities [Abstract]
Derivative Liability, Fair Value, Gross Liability	919	1,976
Netting Adjustments [Member] \| Electricity [Member]
Derivative Assets [Abstract]
Derivative Asset, Fair Value, Gross Asset	(295)	(490)
Liabilities [Abstract]
Derivative Liability, Fair Value, Gross Liability	295	565
Netting Adjustments [Member] \| Other Credit Derivatives [Member]
Derivative Assets [Abstract]
Derivative Asset, Fair Value, Gross Asset	(44)	(25)
Liabilities [Abstract]
Derivative Liability, Fair Value, Gross Liability	44	20
Netting Adjustments [Member] \| Total derivative assets [Member]
Derivative Assets [Abstract]
Derivative Assets	(1,258)	(2,509)
Netting Adjustments [Member] \| Total derivative liabilities [Member]
Liabilities [Abstract]
Derivative Liabilities	$ 1,259	$ 2,564

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This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the Company may deposit additional funds at any time and also effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months.

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