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Commitments and Guarantees Unrecorded Unconditional Purchase Obligations (Details) (USD $) In Millions, unless otherwise specified | Dec. 31, 2012
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Capital Additions [Member] |
Unrecorded Unconditional Purchase Obligation [Line Items] |
Unrecorded Unconditional Purchase Obligation | $ 185
Unrecorded Unconditional Purchase Obligation, Due within One Year | 81
Unrecorded Unconditional Purchase Obligation, Due within Two Years | 10
Unrecorded Unconditional Purchase Obligation, Due within Three Years | 11
Unrecorded Unconditional Purchase Obligation, Due within Four Years | 9
Unrecorded Unconditional Purchase Obligation, Due within Five Years | 2
Unrecorded Unconditional Purchase Obligation, Due after Five Years | 72
Long-term Contract for Purchase of Electric Power [Domain] |
Unrecorded Unconditional Purchase Obligation [Line Items] |
Unrecorded Unconditional Purchase Obligation | 859
Unrecorded Unconditional Purchase Obligation, Due within One Year | 154
Unrecorded Unconditional Purchase Obligation, Due within Two Years | 83
Unrecorded Unconditional Purchase Obligation, Due within Three Years | 82
Unrecorded Unconditional Purchase Obligation, Due within Four Years | 64
Unrecorded Unconditional Purchase Obligation, Due within Five Years | 36
Unrecorded Unconditional Purchase Obligation, Due after Five Years | 440
Electric Transmission [Member] |
Unrecorded Unconditional Purchase Obligation [Line Items] |
Unrecorded Unconditional Purchase Obligation | 81
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 | 20
Unrecorded Unconditional Purchase Obligation, Due within Four Years | 19
Unrecorded Unconditional Purchase Obligation, Due within Five Years | 0
Unrecorded Unconditional Purchase Obligation, Due after Five Years | 0
Public Utility Districts [Member] |
Unrecorded Unconditional Purchase Obligation [Line Items] |
Unrecorded Unconditional Purchase Obligation | 61
Unrecorded Unconditional Purchase Obligation, Due within One Year | 8
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 | 7
Unrecorded Unconditional Purchase Obligation, Due within Five Years | 5
Unrecorded Unconditional Purchase Obligation, Due after Five Years | 25
Natural gas [Member] |
Unrecorded Unconditional Purchase Obligation [Line Items] |
Unrecorded Unconditional Purchase Obligation | 130
Unrecorded Unconditional Purchase Obligation, Due within One Year | 55
Unrecorded Unconditional Purchase Obligation, Due within Two Years | 26
Unrecorded Unconditional Purchase Obligation, Due within Three Years | 21
Unrecorded Unconditional Purchase Obligation, Due within Four Years | 12
Unrecorded Unconditional Purchase Obligation, Due within Five Years | 10
Unrecorded Unconditional Purchase Obligation, Due after Five Years | 6
Coal and transportationSupply Agreements [Member] |
Unrecorded Unconditional Purchase Obligation [Line Items] |
Unrecorded Unconditional Purchase Obligation | 31
Unrecorded Unconditional Purchase Obligation, Due within One Year | 22
Unrecorded Unconditional Purchase Obligation, Due within Two Years | 9
Unrecorded Unconditional Purchase Obligation, Due within Three Years | 0
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
Operatomg leases [Member] |
Unrecorded Unconditional Purchase Obligation [Line Items] |
Unrecorded Unconditional Purchase Obligation | 234
Unrecorded Unconditional Purchase Obligation, Due within One Year | 9
Unrecorded Unconditional Purchase Obligation, Due within Two Years | 9
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 | 11
Unrecorded Unconditional Purchase Obligation, Due after Five Years | 186
Commitments [Member] |
Unrecorded Unconditional Purchase Obligation [Line Items] |
Unrecorded Unconditional Purchase Obligation | 1,581
Unrecorded Unconditional Purchase Obligation, Due within One Year | 350
Unrecorded Unconditional Purchase Obligation, Due within Two Years | 166
Unrecorded Unconditional Purchase Obligation, Due within Three Years | 151
Unrecorded Unconditional Purchase Obligation, Due within Four Years | 121
Unrecorded Unconditional Purchase Obligation, Due within Five Years | 64
Unrecorded Unconditional Purchase Obligation, Due after Five Years | $ 729

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- Definition Amount of the fixed and determinable portion of the unrecorded unconditional purchase obligation maturing in the fifth fiscal year following the latest fiscal year. + References Reference 1: 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 Reference 2: 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. + Details
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- Definition Amount of the fixed and determinable portion of the unrecorded unconditional purchase obligation maturing in the next fiscal year following the latest fiscal year. + References Reference 1: 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 Reference 2: 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. + Details
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- Definition Amount of the fixed and determinable portion of the unrecorded unconditional purchase obligation maturing in the four fiscal year following the latest fiscal year. + References Reference 1: 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 Reference 2: 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. + Details
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- Definition Amount of the fixed and determinable portion of the unrecorded unconditional purchase obligation maturing in the second fiscal year following the latest fiscal year. + References Reference 1: 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 Reference 2: 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. + Details
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- Definition Amount of the fixed and determinable portion of the unrecorded unconditional purchase obligation maturing in the third fiscal year following the latest fiscal year. + References Reference 1: 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 Reference 2: 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. + Details
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- Definition Amount of the unrecorded obligation to transfer funds in the future for fixed or minimum amounts or quantities of goods or services at fixed or minimum prices (for example, as in take-or-pay contracts or throughput contracts). + References Reference 1: 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 Reference 2: 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. + Details
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- Definition Amount of the fixed and determinable portion of the unrecorded unconditional purchase obligation maturing after the fifth fiscal year following the latest fiscal year. + References Reference 1: 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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