Fair Value (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Assets [Abstract]
Cash and Cash Equivalents, Fair Value Disclosure	$ 68
Nuclear decommissioning trusts	1,004	937
Other investments	103	111
Derivative assets Abstract [Abstract]
Derivative Asset, Fair Value, Gross Asset	2,794	2,805
Derivative Assets	1,530	1,344
Liabilities [Abstract]
Derivative Liability, Fair Value, Gross Liability	(2,902)	(2,811)
Derivative Liabilities	(337)	(247)
Derivative Assets (Liabilities), at Fair Value, Net	1,193	1,097
Derivative Assets, Current	277	222
Derivative Assets, Noncurrent	78	74
Derivative Liabilities, Current	238	158
Derivative Liabilities, Noncurrent	99	89
Current Asset [Member]
Liabilities [Abstract]
Derivative Assets, Current	329	222
Non Current Asset [Member]
Liabilities [Abstract]
Derivative Assets, Noncurrent	1,201	1,122
Current Liability [Member]
Liabilities [Abstract]
Derivative Liabilities, Current	(238)	(158)
Noncurrent Liability [Member]
Liabilities [Abstract]
Derivative Liabilities, Noncurrent	(99)	(89)
Foreign currency exchange contracts [Member]
Derivative assets Abstract [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 [Abstract]
Derivative Asset, Fair Value, Gross Asset	30	33
Liabilities [Abstract]
Derivative Liability, Fair Value, Gross Liability	(108)	(104)
Electricity [Member]
Derivative assets Abstract [Abstract]
Derivative Asset, Fair Value, Gross Asset	318	257
Liabilities [Abstract]
Derivative Liability, Fair Value, Gross Liability	(229)	(140)
Other [Member]
Derivative assets Abstract [Abstract]
Derivative Asset, Fair Value, Gross Asset	7	6
Liabilities [Abstract]
Derivative Liability, Fair Value, Gross Liability	2	0
Total derivative assets [Member]
Derivative assets Abstract [Abstract]
Derivative Assets	355	296
Total derivative liabilities [Member]
Liabilities [Abstract]
Derivative Liabilities	(337)	(247)
Fair Value, Inputs, Level 1 [Member]
Assets [Abstract]
Cash and Cash Equivalents, Fair Value Disclosure	0
Nuclear decommissioning trusts	629	577
Other investments	62	57
Derivative assets Abstract [Abstract]
Derivative Assets	2,304	2,583
Liabilities [Abstract]
Derivative Liabilities	(1,718)	(1,959)
Derivative Assets (Liabilities), at Fair Value, Net	586	624
Derivative Assets, Current	1,339	1,571
Derivative Assets, Noncurrent	965	1,012
Derivative Liabilities, Current	(1,391)	(1,603)
Derivative Liabilities, Noncurrent	(327)	(356)
Fair Value, Inputs, Level 1 [Member] \| Foreign currency exchange contracts [Member]
Derivative assets Abstract [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 [Abstract]
Derivative Asset, Fair Value, Gross Asset	1,568	1,926
Liabilities [Abstract]
Derivative Liability, Fair Value, Gross Liability	(1,681)	(1,940)
Fair Value, Inputs, Level 1 [Member] \| Electricity [Member]
Derivative assets Abstract [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 [Member]
Derivative assets Abstract [Abstract]
Derivative Asset, Fair Value, Gross Asset	45	23
Liabilities [Abstract]
Derivative Liability, Fair Value, Gross Liability	(37)	(19)
Fair Value, Inputs, Level 1 [Member] \| Total derivative assets [Member]
Derivative assets Abstract [Abstract]
Derivative Assets	1,613	1,949
Fair Value, Inputs, Level 1 [Member] \| Total derivative liabilities [Member]
Liabilities [Abstract]
Derivative Liabilities	(1,718)	(1,959)
Fair Value, Inputs, Level 2 [Member]
Assets [Abstract]
Cash and Cash Equivalents, Fair Value Disclosure	68
Nuclear decommissioning trusts	375	360
Other investments	41	54
Derivative assets Abstract [Abstract]
Derivative Assets	1,265	1,020
Liabilities [Abstract]
Derivative Liabilities	(821)	(646)
Derivative Assets (Liabilities), at Fair Value, Net	444	374
Derivative Assets, Current	711	520
Derivative Assets, Noncurrent	554	500
Derivative Liabilities, Current	(687)	(527)
Derivative Liabilities, Noncurrent	(134)	(119)
Fair Value, Inputs, Level 2 [Member] \| Foreign currency exchange contracts [Member]
Derivative assets Abstract [Abstract]
Derivative Asset, Fair Value, Gross Asset	2	3
Liabilities [Abstract]
Derivative Liability, Fair Value, Gross Liability	(3)	(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 [Abstract]
Derivative Asset, Fair Value, Gross Asset	102	78
Liabilities [Abstract]
Derivative Liability, Fair Value, Gross Liability	(143)	(126)
Fair Value, Inputs, Level 2 [Member] \| Electricity [Member]
Derivative assets Abstract [Abstract]
Derivative Asset, Fair Value, Gross Asset	675	523
Liabilities [Abstract]
Derivative Liability, Fair Value, Gross Liability	(674)	(513)
Fair Value, Inputs, Level 2 [Member] \| Other [Member]
Derivative assets Abstract [Abstract]
Derivative Asset, Fair Value, Gross Asset	2	2
Liabilities [Abstract]
Derivative Liability, Fair Value, Gross Liability	0	(1)
Fair Value, Inputs, Level 2 [Member] \| Total derivative assets [Member]
Derivative assets Abstract [Abstract]
Derivative Assets	781	606
Fair Value, Inputs, Level 2 [Member] \| Total derivative liabilities [Member]
Liabilities [Abstract]
Derivative Liabilities	(821)	(646)
Fair Value, Inputs, Level 3 [Member]
Assets [Abstract]
Cash and Cash Equivalents, Fair Value Disclosure	0
Nuclear decommissioning trusts	0	0
Other investments	0	0
Derivative assets Abstract [Abstract]
Derivative Assets	400	250
Liabilities [Abstract]
Derivative Liabilities	(363)	(206)
Derivative Assets (Liabilities), at Fair Value, Net	37	44
Derivative Assets, Current	327	181
Derivative Assets, Noncurrent	73	69
Derivative Liabilities, Current	(290)	(152)
Derivative Liabilities, Noncurrent	(73)	(54)
Fair Value, Inputs, Level 3 [Member] \| Foreign currency exchange contracts [Member]
Derivative assets Abstract [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 [Abstract]
Derivative Asset, Fair Value, Gross Asset	31	20
Liabilities [Abstract]
Derivative Liability, Fair Value, Gross Liability	(25)	(14)
Fair Value, Inputs, Level 3 [Member] \| Electricity [Member]
Derivative assets Abstract [Abstract]
Derivative Asset, Fair Value, Gross Asset	363	224
Liabilities [Abstract]
Derivative Liability, Fair Value, Gross Liability	(338)	(192)
Fair Value, Inputs, Level 3 [Member] \| Other [Member]
Derivative assets Abstract [Abstract]
Derivative Asset, Fair Value, Gross Asset	6	6
Liabilities [Abstract]
Derivative Liability, Fair Value, Gross Liability	0	0
Fair Value, Inputs, Level 3 [Member] \| Total derivative assets [Member]
Derivative assets Abstract [Abstract]
Derivative Assets	400	250
Fair Value, Inputs, Level 3 [Member] \| Total derivative liabilities [Member]
Liabilities [Abstract]
Derivative Liabilities	(363)	(206)
Netting Adjustments [Member]
Assets [Abstract]
Cash and Cash Equivalents, Fair Value Disclosure	0
Nuclear decommissioning trusts	0	0
Other investments	0	0
Derivative assets Abstract [Abstract]
Derivative Assets	(2,439)	(2,509)
Liabilities [Abstract]
Derivative Liabilities	2,565	2,564
Derivative Assets (Liabilities), at Fair Value, Net	126	55
Derivative Assets, Current	(2,048)	(2,050)
Derivative Assets, Noncurrent	(391)	(459)
Derivative Liabilities, Current	2,130	2,124
Derivative Liabilities, Noncurrent	435	440
Netting Adjustments [Member] \| Foreign currency exchange contracts [Member]
Derivative assets Abstract [Abstract]
Derivative Asset, Fair Value, Gross Asset	(2)	(3)
Liabilities [Abstract]
Derivative Liability, Fair Value, Gross Liability	2	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 [Abstract]
Derivative Asset, Fair Value, Gross Asset	(1,671)	(1,991)
Liabilities [Abstract]
Derivative Liability, Fair Value, Gross Liability	1,741	1,976
Netting Adjustments [Member] \| Electricity [Member]
Derivative assets Abstract [Abstract]
Derivative Asset, Fair Value, Gross Asset	(720)	(490)
Liabilities [Abstract]
Derivative Liability, Fair Value, Gross Liability	783	565
Netting Adjustments [Member] \| Other [Member]
Derivative assets Abstract [Abstract]
Derivative Asset, Fair Value, Gross Asset	(46)	(25)
Liabilities [Abstract]
Derivative Liability, Fair Value, Gross Liability	39	20
Netting Adjustments [Member] \| Total derivative assets [Member]
Derivative assets Abstract [Abstract]
Derivative Assets	(2,439)	(2,509)
Netting Adjustments [Member] \| Total derivative liabilities [Member]
Liabilities [Abstract]
Derivative Liabilities	$ 2,565	$ 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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