Fair Value (Details) (USD $) In Millions	Sep. 30, 2011	Dec. 31, 2010
Assets [Abstract]
Nuclear decommissioning trusts	$ 893	$ 939
Other investments	104	111
Derivative assets Abstract [Abstract]
Derivative Assets	1,165	1,258
Derivative Assets, Current	109	131
Derivative Assets, Noncurrent	59	77
Liabilities [Abstract]
Derivative Liabilities	(176)	(252)
Derivative Liabilities, Current	114	142
Derivative Liabilities, Noncurrent	62	110
Derivative Assets (Liabilities), at Fair Value, Net	989	1,006
Fair Value, Inputs, Level 1 [Member]
Assets [Abstract]
Nuclear decommissioning trusts	532	599
Other investments	48	56
Derivative assets Abstract [Abstract]
Derivative Assets	2,252	2,569
Derivative Assets, Current	1,251	1,299
Derivative Assets, Noncurrent	1,001	1,270
Liabilities [Abstract]
Derivative Liabilities	(1,630)	(1,907)
Derivative Liabilities, Current	(1,235)	(1,290)
Derivative Liabilities, Noncurrent	(395)	(617)
Derivative Assets (Liabilities), at Fair Value, Net	622	662
Fair Value, Inputs, Level 1 [Member] \| Interest Rate Contract [Member]
Liabilities [Abstract]
Derivative Liability, Fair Value, Gross Liability	0	0
Fair Value, Inputs, Level 1 [Member] \| Foreign Exchange Contract [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] \| Natural Gas [Member]
Derivative assets Abstract [Abstract]
Derivative Asset, Fair Value, Gross Asset	1,650	1,846
Liabilities [Abstract]
Derivative Liability, Fair Value, Gross Liability	(1,616)	(1,844)
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	22	68
Liabilities [Abstract]
Derivative Liability, Fair Value, Gross Liability	(14)	(63)
Fair Value, Inputs, Level 1 [Member] \| Derivative Financial Instruments, Assets [Member]
Derivative assets Abstract [Abstract]
Derivative Assets	1,672	1,914
Fair Value, Inputs, Level 1 [Member] \| Derivative Financial Instruments, Liabilities [Member]
Liabilities [Abstract]
Derivative Liabilities	(1,630)	(1,907)
Fair Value, Inputs, Level 2 [Member]
Assets [Abstract]
Nuclear decommissioning trusts	361	340
Other investments	56	55
Derivative assets Abstract [Abstract]
Derivative Assets	828	1,196
Derivative Assets, Current	322	663
Derivative Assets, Noncurrent	506	533
Liabilities [Abstract]
Derivative Liabilities	(473)	(955)
Derivative Liabilities, Current	(348)	(730)
Derivative Liabilities, Noncurrent	(125)	(225)
Derivative Assets (Liabilities), at Fair Value, Net	355	241
Fair Value, Inputs, Level 2 [Member] \| Interest Rate Contract [Member]
Liabilities [Abstract]
Derivative Liability, Fair Value, Gross Liability	(1)	(1)
Fair Value, Inputs, Level 2 [Member] \| Foreign Exchange Contract [Member]
Derivative assets Abstract [Abstract]
Derivative Asset, Fair Value, Gross Asset	6	20
Liabilities [Abstract]
Derivative Liability, Fair Value, Gross Liability	(9)	(30)
Fair Value, Inputs, Level 2 [Member] \| Natural Gas [Member]
Derivative assets Abstract [Abstract]
Derivative Asset, Fair Value, Gross Asset	79	128
Liabilities [Abstract]
Derivative Liability, Fair Value, Gross Liability	(167)	(263)
Fair Value, Inputs, Level 2 [Member] \| Electricity [Member]
Derivative assets Abstract [Abstract]
Derivative Asset, Fair Value, Gross Asset	326	649
Liabilities [Abstract]
Derivative Liability, Fair Value, Gross Liability	(295)	(653)
Fair Value, Inputs, Level 2 [Member] \| Other [Member]
Derivative assets Abstract [Abstract]
Derivative Asset, Fair Value, Gross Asset	0	4
Liabilities [Abstract]
Derivative Liability, Fair Value, Gross Liability	(1)	(8)
Fair Value, Inputs, Level 2 [Member] \| Derivative Financial Instruments, Assets [Member]
Derivative assets Abstract [Abstract]
Derivative Assets	411	801
Fair Value, Inputs, Level 2 [Member] \| Derivative Financial Instruments, Liabilities [Member]
Liabilities [Abstract]
Derivative Liabilities	(473)	(955)
Fair Value, Inputs, Level 3 [Member]
Assets [Abstract]
Nuclear decommissioning trusts	0	0
Other investments	0	0
Derivative assets Abstract [Abstract]
Derivative Assets	91	133
Derivative Assets, Current	62	49
Derivative Assets, Noncurrent	29	84
Liabilities [Abstract]
Derivative Liabilities	(82)	(74)
Derivative Liabilities, Current	(60)	(21)
Derivative Liabilities, Noncurrent	(22)	(53)
Derivative Assets (Liabilities), at Fair Value, Net	9	59
Fair Value, Inputs, Level 3 [Member] \| Interest Rate Contract [Member]
Liabilities [Abstract]
Derivative Liability, Fair Value, Gross Liability	0	0
Fair Value, Inputs, Level 3 [Member] \| Foreign Exchange Contract [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] \| Natural Gas [Member]
Derivative assets Abstract [Abstract]
Derivative Asset, Fair Value, Gross Asset	17	12
Liabilities [Abstract]
Derivative Liability, Fair Value, Gross Liability	(12)	(11)
Fair Value, Inputs, Level 3 [Member] \| Electricity [Member]
Derivative assets Abstract [Abstract]
Derivative Asset, Fair Value, Gross Asset	67	117
Liabilities [Abstract]
Derivative Liability, Fair Value, Gross Liability	(70)	(63)
Fair Value, Inputs, Level 3 [Member] \| Other [Member]
Derivative assets Abstract [Abstract]
Derivative Asset, Fair Value, Gross Asset	7	4
Liabilities [Abstract]
Derivative Liability, Fair Value, Gross Liability	0	0
Fair Value, Inputs, Level 3 [Member] \| Derivative Financial Instruments, Assets [Member]
Derivative assets Abstract [Abstract]
Derivative Assets	91	133
Fair Value, Inputs, Level 3 [Member] \| Derivative Financial Instruments, Liabilities [Member]
Liabilities [Abstract]
Derivative Liabilities	(82)	(74)
Netting and Collateral [Member]
Assets [Abstract]
Nuclear decommissioning trusts	0	0
Other investments	0	0
Derivative assets Abstract [Abstract]
Derivative Assets	(2,006)	(2,640)
Derivative Assets, Current	(1,526)	(1,880)
Derivative Assets, Noncurrent	(480)	(760)
Liabilities [Abstract]
Derivative Liabilities	2,009	2,684
Derivative Liabilities, Current	1,529	1,899
Derivative Liabilities, Noncurrent	480	785
Derivative Assets (Liabilities), at Fair Value, Net	3	44
Netting and Collateral [Member] \| Interest Rate Contract [Member]
Liabilities [Abstract]
Derivative Liability, Fair Value, Gross Liability	0	0
Netting and Collateral [Member] \| Foreign Exchange Contract [Member]
Derivative assets Abstract [Abstract]
Derivative Asset, Fair Value, Gross Asset	(6)	(20)
Liabilities [Abstract]
Derivative Liability, Fair Value, Gross Liability	6	20
Netting and Collateral [Member] \| Natural Gas [Member]
Derivative assets Abstract [Abstract]
Derivative Asset, Fair Value, Gross Asset	(1,698)	(1,960)
Liabilities [Abstract]
Derivative Liability, Fair Value, Gross Liability	1,698	1,955
Netting and Collateral [Member] \| Electricity [Member]
Derivative assets Abstract [Abstract]
Derivative Asset, Fair Value, Gross Asset	(282)	(589)
Liabilities [Abstract]
Derivative Liability, Fair Value, Gross Liability	285	643
Netting and Collateral [Member] \| Other [Member]
Derivative assets Abstract [Abstract]
Derivative Asset, Fair Value, Gross Asset	(20)	(71)
Liabilities [Abstract]
Derivative Liability, Fair Value, Gross Liability	20	66
Netting and Collateral [Member] \| Derivative Financial Instruments, Assets [Member]
Derivative assets Abstract [Abstract]
Derivative Assets	(2,006)	(2,640)
Netting and Collateral [Member] \| Derivative Financial Instruments, Liabilities [Member]
Liabilities [Abstract]
Derivative Liabilities	2,009	2,684
Current Asset [Member]
Derivative assets Abstract [Abstract]
Derivative Assets, Current	109	131
Non Current Asset [Member]
Derivative assets Abstract [Abstract]
Derivative Assets, Noncurrent	1,056	1,127
Current Liability [Member]
Liabilities [Abstract]
Derivative Liabilities, Current	(114)	(142)
Noncurrent Liability [Member]
Liabilities [Abstract]
Derivative Liabilities, Noncurrent	(62)	(110)
Interest Rate Contract [Member]
Liabilities [Abstract]
Derivative Liability, Fair Value, Gross Liability	(1)	(1)
Foreign Exchange Contract [Member]
Derivative assets Abstract [Abstract]
Derivative Asset, Fair Value, Gross Asset	0	0
Liabilities [Abstract]
Derivative Liability, Fair Value, Gross Liability	(3)	(10)
Natural Gas [Member]
Derivative assets Abstract [Abstract]
Derivative Asset, Fair Value, Gross Asset	48	26
Liabilities [Abstract]
Derivative Liability, Fair Value, Gross Liability	(97)	(163)
Electricity [Member]
Derivative assets Abstract [Abstract]
Derivative Asset, Fair Value, Gross Asset	111	177
Liabilities [Abstract]
Derivative Liability, Fair Value, Gross Liability	(80)	(73)
Other [Member]
Derivative assets Abstract [Abstract]
Derivative Asset, Fair Value, Gross Asset	9	5
Liabilities [Abstract]
Derivative Liability, Fair Value, Gross Liability	5	(5)
Derivative Financial Instruments, Assets [Member]
Derivative assets Abstract [Abstract]
Derivative Assets	168	208
Derivative Financial Instruments, Liabilities [Member]
Liabilities [Abstract]
Derivative Liabilities	$ (176)	$ (252)

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The fair value of investments held in a trust fund to pay for the costs of decontaminating and decommissioning facilities, whether such amount is presented as a separate caption or as a parenthetical disclosure on the balance sheet. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements.

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