Fair Value (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	$ 123	$ 140
Assets [Abstract]
Nuclear decommissioning trusts	1,037	937
Other investments	110	95
Derivative assets [Abstract]
Derivative Asset, Fair Value, Gross Asset	1,016	2,805
Derivative Assets	1,417	1,468
Derivative liabilities [Abstract]
Derivative Liability, Fair Value, Gross Liability	(1,020)	(2,811)
Derivative Liabilities	(151)	(247)
Derivative Assets (Liabilities), at Fair Value, Net	1,266	1,221
Derivative Assets, Current	108	222
Derivative Assets, Noncurrent	39	74
Derivative Liabilities, Current	125	158
Derivative Liabilities, Noncurrent	26	89
Current Asset [Member]
Derivative liabilities [Abstract]
Derivative Assets, Current	231	362
Non Current Asset [Member]
Derivative liabilities [Abstract]
Derivative Assets, Noncurrent	1,186	1,106
Current Liability [Member]
Derivative liabilities [Abstract]
Derivative Liabilities, Current	(125)	(158)
Noncurrent Liability [Member]
Derivative liabilities [Abstract]
Derivative Liabilities, Noncurrent	(26)	(89)
Foreign currency exchange contracts [Member]
Derivative assets [Abstract]
Derivative Asset, Fair Value, Gross Asset	0	0
Derivative liabilities [Abstract]
Derivative Liability, Fair Value, Gross Liability	0	(2)
Interest rate contracts [Member]
Derivative liabilities [Abstract]
Derivative Liability, Fair Value, Gross Liability	(1)	(1)
Natural Gas [Member]
Derivative assets [Abstract]
Derivative Asset, Fair Value, Gross Asset	40	33
Derivative liabilities [Abstract]
Derivative Liability, Fair Value, Gross Liability	(56)	(104)
Electricity [Member]
Derivative assets [Abstract]
Derivative Asset, Fair Value, Gross Asset	102	257
Derivative liabilities [Abstract]
Derivative Liability, Fair Value, Gross Liability	(93)	(140)
Other [Member]
Derivative assets [Abstract]
Derivative Asset, Fair Value, Gross Asset	5	6
Derivative liabilities [Abstract]
Derivative Liability, Fair Value, Gross Liability	(1)	0
Total derivative assets [Member]
Derivative assets [Abstract]
Derivative Assets	147	296
Total derivative liabilities [Member]
Derivative liabilities [Abstract]
Derivative Liabilities	(151)	(247)
Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	0	0
Assets [Abstract]
Nuclear decommissioning trusts	694	577
Other investments	66	57
Derivative assets [Abstract]
Derivative Assets	1,321	2,583
Derivative liabilities [Abstract]
Derivative Liabilities	(532)	(1,959)
Derivative Assets (Liabilities), at Fair Value, Net	789	624
Derivative Assets, Current	493	1,571
Derivative Assets, Noncurrent	828	1,012
Derivative Liabilities, Current	(466)	(1,603)
Derivative Liabilities, Noncurrent	(66)	(356)
Fair Value, Inputs, Level 1 [Member] \| Foreign currency exchange contracts [Member]
Derivative assets [Abstract]
Derivative Asset, Fair Value, Gross Asset	0	0
Derivative liabilities [Abstract]
Derivative Liability, Fair Value, Gross Liability	0	0
Fair Value, Inputs, Level 1 [Member] \| Interest rate contracts [Member]
Derivative 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	555	1,926
Derivative liabilities [Abstract]
Derivative Liability, Fair Value, Gross Liability	(526)	(1,940)
Fair Value, Inputs, Level 1 [Member] \| Electricity [Member]
Derivative assets [Abstract]
Derivative Asset, Fair Value, Gross Asset	0	0
Derivative liabilities [Abstract]
Derivative Liability, Fair Value, Gross Liability	0	0
Fair Value, Inputs, Level 1 [Member] \| Other [Member]
Derivative assets [Abstract]
Derivative Asset, Fair Value, Gross Asset	6	23
Derivative liabilities [Abstract]
Derivative Liability, Fair Value, Gross Liability	(6)	(19)
Fair Value, Inputs, Level 1 [Member] \| Total derivative assets [Member]
Derivative assets [Abstract]
Derivative Assets	561	1,949
Fair Value, Inputs, Level 1 [Member] \| Total derivative liabilities [Member]
Derivative liabilities [Abstract]
Derivative Liabilities	(532)	(1,959)
Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	123	140
Assets [Abstract]
Nuclear decommissioning trusts	343	360
Other investments	44	38
Derivative assets [Abstract]
Derivative Assets	805	1,144
Derivative liabilities [Abstract]
Derivative Liabilities	(315)	(646)
Derivative Assets (Liabilities), at Fair Value, Net	490	498
Derivative Assets, Current	372	660
Derivative Assets, Noncurrent	433	484
Derivative Liabilities, Current	(269)	(527)
Derivative Liabilities, Noncurrent	(46)	(119)
Fair Value, Inputs, Level 2 [Member] \| Foreign currency exchange contracts [Member]
Derivative assets [Abstract]
Derivative Asset, Fair Value, Gross Asset	0	3
Derivative liabilities [Abstract]
Derivative Liability, Fair Value, Gross Liability	0	(5)
Fair Value, Inputs, Level 2 [Member] \| Interest rate contracts [Member]
Derivative 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	66	78
Derivative liabilities [Abstract]
Derivative Liability, Fair Value, Gross Liability	(73)	(126)
Fair Value, Inputs, Level 2 [Member] \| Electricity [Member]
Derivative assets [Abstract]
Derivative Asset, Fair Value, Gross Asset	226	523
Derivative liabilities [Abstract]
Derivative Liability, Fair Value, Gross Liability	(240)	(513)
Fair Value, Inputs, Level 2 [Member] \| Other [Member]
Derivative assets [Abstract]
Derivative Asset, Fair Value, Gross Asset	3	2
Derivative 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	295	606
Fair Value, Inputs, Level 2 [Member] \| Total derivative liabilities [Member]
Derivative liabilities [Abstract]
Derivative Liabilities	(315)	(646)
Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	0	0
Assets [Abstract]
Nuclear decommissioning trusts	0	0
Other investments	0	0
Derivative assets [Abstract]
Derivative Assets	160	250
Derivative liabilities [Abstract]
Derivative Liabilities	(173)	(206)
Derivative Assets (Liabilities), at Fair Value, Net	(13)	44
Derivative Assets, Current	120	181
Derivative Assets, Noncurrent	40	69
Derivative Liabilities, Current	(144)	(152)
Derivative Liabilities, Noncurrent	(29)	(54)
Fair Value, Inputs, Level 3 [Member] \| Foreign currency exchange contracts [Member]
Derivative assets [Abstract]
Derivative Asset, Fair Value, Gross Asset	0	0
Derivative liabilities [Abstract]
Derivative Liability, Fair Value, Gross Liability	0	0
Fair Value, Inputs, Level 3 [Member] \| Interest rate contracts [Member]
Derivative 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	24	20
Derivative liabilities [Abstract]
Derivative Liability, Fair Value, Gross Liability	(62)	(14)
Fair Value, Inputs, Level 3 [Member] \| Electricity [Member]
Derivative assets [Abstract]
Derivative Asset, Fair Value, Gross Asset	134	224
Derivative liabilities [Abstract]
Derivative Liability, Fair Value, Gross Liability	(111)	(192)
Fair Value, Inputs, Level 3 [Member] \| Other [Member]
Derivative assets [Abstract]
Derivative Asset, Fair Value, Gross Asset	2	6
Derivative liabilities [Abstract]
Derivative Liability, Fair Value, Gross Liability	0	0
Fair Value, Inputs, Level 3 [Member] \| Total derivative assets [Member]
Derivative assets [Abstract]
Derivative Assets	160	250
Fair Value, Inputs, Level 3 [Member] \| Total derivative liabilities [Member]
Derivative liabilities [Abstract]
Derivative Liabilities	(173)	(206)
Netting Adjustments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	0	0
Assets [Abstract]
Nuclear decommissioning trusts	0	0
Other investments	0	0
Derivative assets [Abstract]
Derivative Assets	(869)	(2,509)
Derivative liabilities [Abstract]
Derivative Liabilities	869	2,564
Derivative Assets (Liabilities), at Fair Value, Net	0	55
Derivative Assets, Current	(754)	(2,050)
Derivative Assets, Noncurrent	(115)	(459)
Derivative Liabilities, Current	754	2,124
Derivative Liabilities, Noncurrent	115	440
Netting Adjustments [Member] \| Foreign currency exchange contracts [Member]
Derivative assets [Abstract]
Derivative Asset, Fair Value, Gross Asset	0	(3)
Derivative liabilities [Abstract]
Derivative Liability, Fair Value, Gross Liability	0	3
Netting Adjustments [Member] \| Interest rate contracts [Member]
Derivative 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	(605)	(1,991)
Derivative liabilities [Abstract]
Derivative Liability, Fair Value, Gross Liability	605	1,976
Netting Adjustments [Member] \| Electricity [Member]
Derivative assets [Abstract]
Derivative Asset, Fair Value, Gross Asset	(258)	(490)
Derivative liabilities [Abstract]
Derivative Liability, Fair Value, Gross Liability	258	565
Netting Adjustments [Member] \| Other [Member]
Derivative assets [Abstract]
Derivative Asset, Fair Value, Gross Asset	(6)	(25)
Derivative liabilities [Abstract]
Derivative Liability, Fair Value, Gross Liability	6	20
Netting Adjustments [Member] \| Total derivative assets [Member]
Derivative assets [Abstract]
Derivative Assets	(869)	(2,509)
Netting Adjustments [Member] \| Total derivative liabilities [Member]
Derivative liabilities [Abstract]
Derivative Liabilities	$ 869	$ 2,564

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