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Commitments and Guarantees Unrecorded Unconditional Purchase Obligations (Details) (USD $) In Millions, unless otherwise specified | Dec. 31, 2011
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Capital Additions [Member] |
Unrecorded Unconditional Purchase Obligation [Line Items] |
Unrecorded Unconditional Purchase Obligation | $ 175
Unrecorded Unconditional Purchase Obligation, Due within One Year | 58
Unrecorded Unconditional Purchase Obligation, Due within Two Years | 18
Unrecorded Unconditional Purchase Obligation, Due within Three Years | 10
Unrecorded Unconditional Purchase Obligation, Due within Four Years | 10
Unrecorded Unconditional Purchase Obligation, Due within Five Years | 6
Unrecorded Unconditional Purchase Obligation, Due after Five Years | 73
Long-term Contract for Purchase of Electric Power [Domain] |
Unrecorded Unconditional Purchase Obligation [Line Items] |
Unrecorded Unconditional Purchase Obligation | 796
Unrecorded Unconditional Purchase Obligation, Due within One Year | 129
Unrecorded Unconditional Purchase Obligation, Due within Two Years | 77
Unrecorded Unconditional Purchase Obligation, Due within Three Years | 76
Unrecorded Unconditional Purchase Obligation, Due within Four Years | 76
Unrecorded Unconditional Purchase Obligation, Due within Five Years | 57
Unrecorded Unconditional Purchase Obligation, Due after Five Years | 381
Electric Transmission [Member] |
Unrecorded Unconditional Purchase Obligation [Line Items] |
Unrecorded Unconditional Purchase Obligation | 102
Unrecorded Unconditional Purchase Obligation, Due within One Year | 21
Unrecorded Unconditional Purchase Obligation, Due within Two Years | 21
Unrecorded Unconditional Purchase Obligation, Due within Three Years | 21
Unrecorded Unconditional Purchase Obligation, Due within Four Years | 20
Unrecorded Unconditional Purchase Obligation, Due within Five Years | 19
Unrecorded Unconditional Purchase Obligation, Due after Five Years | 0
Public Utility Districts [Member] |
Unrecorded Unconditional Purchase Obligation [Line Items] |
Unrecorded Unconditional Purchase Obligation | 68
Unrecorded Unconditional Purchase Obligation, Due within One Year | 7
Unrecorded Unconditional Purchase Obligation, Due within Two Years | 8
Unrecorded Unconditional Purchase Obligation, Due within Three Years | 8
Unrecorded Unconditional Purchase Obligation, Due within Four Years | 8
Unrecorded Unconditional Purchase Obligation, Due within Five Years | 7
Unrecorded Unconditional Purchase Obligation, Due after Five Years | 30
Public Utilities, Inventory, Fuel [Member] |
Unrecorded Unconditional Purchase Obligation [Line Items] |
Unrecorded Unconditional Purchase Obligation | 136
Unrecorded Unconditional Purchase Obligation, Due within One Year | 49
Unrecorded Unconditional Purchase Obligation, Due within Two Years | 22
Unrecorded Unconditional Purchase Obligation, Due within Three Years | 22
Unrecorded Unconditional Purchase Obligation, Due within Four Years | 20
Unrecorded Unconditional Purchase Obligation, Due within Five Years | 12
Unrecorded Unconditional Purchase Obligation, Due after Five Years | 11
Coal Supply Agreements [Member] |
Unrecorded Unconditional Purchase Obligation [Line Items] |
Unrecorded Unconditional Purchase Obligation | 53
Unrecorded Unconditional Purchase Obligation, Due within One Year | 25
Unrecorded Unconditional Purchase Obligation, Due within Two Years | 19
Unrecorded Unconditional Purchase Obligation, Due within Three Years | 9
Unrecorded Unconditional Purchase Obligation, Due within Four Years | 0
Unrecorded Unconditional Purchase Obligation, Due within Five Years | 0
Unrecorded Unconditional Purchase Obligation, Due after Five Years | 0
Lease Agreements [Member] |
Unrecorded Unconditional Purchase Obligation [Line Items] |
Unrecorded Unconditional Purchase Obligation | 244
Unrecorded Unconditional Purchase Obligation, Due within One Year | 9
Unrecorded Unconditional Purchase Obligation, Due within Two Years | 10
Unrecorded Unconditional Purchase Obligation, Due within Three Years | 9
Unrecorded Unconditional Purchase Obligation, Due within Four Years | 10
Unrecorded Unconditional Purchase Obligation, Due within Five Years | 10
Unrecorded Unconditional Purchase Obligation, Due after Five Years | 196
Commitments [Member] |
Unrecorded Unconditional Purchase Obligation [Line Items] |
Unrecorded Unconditional Purchase Obligation | 1,574
Unrecorded Unconditional Purchase Obligation, Due within One Year | 298
Unrecorded Unconditional Purchase Obligation, Due within Two Years | 175
Unrecorded Unconditional Purchase Obligation, Due within Three Years | 155
Unrecorded Unconditional Purchase Obligation, Due within Four Years | 144
Unrecorded Unconditional Purchase Obligation, Due within Five Years | 111
Unrecorded Unconditional Purchase Obligation, Due after Five Years | $ 691

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- Definition The remaining amount of the fixed and determinable portion of an unrecorded unconditional purchase obligation to be paid in more than four and within five years from the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 47 -Paragraph 7 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 440 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394976&loc=d3e25336-109308 + Details
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- Definition The remaining amount of the fixed and determinable portion of an unrecorded unconditional purchase obligation to be paid within one year of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 47 -Paragraph 7 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 440 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394976&loc=d3e25336-109308 + Details
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- Definition The remaining amount of the fixed and determinable portion of an unrecorded unconditional purchase obligation to be paid in more than three and within four years from the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 47 -Paragraph 7 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 440 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394976&loc=d3e25336-109308 + Details
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X
- Definition The remaining amount of the fixed and determinable portion of an unrecorded unconditional purchase obligation to be paid in more than one and within two years from the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 47 -Paragraph 7 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 440 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394976&loc=d3e25336-109308 + Details
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- Definition The remaining amount of the fixed and determinable portion of an unrecorded unconditional purchase obligation to be paid in more than two and within three years from the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 47 -Paragraph 7 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 440 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394976&loc=d3e25336-109308 + Details
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- Definition The amount of the fixed and determinable portion of an unrecorded unconditional purchase obligation as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 47 -Paragraph 7 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 440 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394976&loc=d3e25336-109308 + Details
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- Definition The remaining amount of the fixed and determinable portion of an unrecorded unconditional purchase obligation to be paid after five years from the balance sheet date. + References No definition available. + Details
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