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Commitments and Guarantees Unrecorded Unconditional Purchase Obligations (Details) (USD $) In Millions, unless otherwise specified | Dec. 31, 2013
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Capital Additions [Member] |
Unrecorded Unconditional Purchase Obligation [Line Items] |
Unrecorded Unconditional Purchase Obligation | $ 934
Unrecorded Unconditional Purchase Obligation, Due within One Year | 710
Unrecorded Unconditional Purchase Obligation, Due within Two Years | 113
Unrecorded Unconditional Purchase Obligation, Due within Three Years | 40
Unrecorded Unconditional Purchase Obligation, Due within Four Years | 2
Unrecorded Unconditional Purchase Obligation, Due within Five Years | 2
Unrecorded Unconditional Purchase Obligation, Due after Five Years | 67
Long-term Contract for Purchase of Electric Power [Domain] |
Unrecorded Unconditional Purchase Obligation [Line Items] |
Unrecorded Unconditional Purchase Obligation | 1,483
Unrecorded Unconditional Purchase Obligation, Due within One Year | 240
Unrecorded Unconditional Purchase Obligation, Due within Two Years | 159
Unrecorded Unconditional Purchase Obligation, Due within Three Years | 150
Unrecorded Unconditional Purchase Obligation, Due within Four Years | 125
Unrecorded Unconditional Purchase Obligation, Due within Five Years | 126
Unrecorded Unconditional Purchase Obligation, Due after Five Years | 683
Electric Transmission [Member] |
Unrecorded Unconditional Purchase Obligation [Line Items] |
Unrecorded Unconditional Purchase Obligation | 72
Unrecorded Unconditional Purchase Obligation, Due within One Year | 22
Unrecorded Unconditional Purchase Obligation, Due within Two Years | 23
Unrecorded Unconditional Purchase Obligation, Due within Three Years | 22
Unrecorded Unconditional Purchase Obligation, Due within Four Years | 2
Unrecorded Unconditional Purchase Obligation, Due within Five Years | 2
Unrecorded Unconditional Purchase Obligation, Due after Five Years | 1
Public Utility Districts [Member] |
Unrecorded Unconditional Purchase Obligation [Line Items] |
Unrecorded Unconditional Purchase Obligation | 66
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 | 7
Unrecorded Unconditional Purchase Obligation, Due within Four Years | 5
Unrecorded Unconditional Purchase Obligation, Due within Five Years | 5
Unrecorded Unconditional Purchase Obligation, Due after Five Years | 33
Natural gas [Member] |
Unrecorded Unconditional Purchase Obligation [Line Items] |
Unrecorded Unconditional Purchase Obligation | 122
Unrecorded Unconditional Purchase Obligation, Due within One Year | 65
Unrecorded Unconditional Purchase Obligation, Due within Two Years | 21
Unrecorded Unconditional Purchase Obligation, Due within Three Years | 12
Unrecorded Unconditional Purchase Obligation, Due within Four Years | 10
Unrecorded Unconditional Purchase Obligation, Due within Five Years | 8
Unrecorded Unconditional Purchase Obligation, Due after Five Years | 6
Coal and transportationSupply Agreements [Member] |
Unrecorded Unconditional Purchase Obligation [Line Items] |
Unrecorded Unconditional Purchase Obligation | 48
Unrecorded Unconditional Purchase Obligation, Due within One Year | 21
Unrecorded Unconditional Purchase Obligation, Due within Two Years | 6
Unrecorded Unconditional Purchase Obligation, Due within Three Years | 6
Unrecorded Unconditional Purchase Obligation, Due within Four Years | 6
Unrecorded Unconditional Purchase Obligation, Due within Five Years | 4
Unrecorded Unconditional Purchase Obligation, Due after Five Years | 5
Operatomg leases [Member] |
Unrecorded Unconditional Purchase Obligation [Line Items] |
Unrecorded Unconditional Purchase Obligation | 241
Unrecorded Unconditional Purchase Obligation, Due within One Year | 11
Unrecorded Unconditional Purchase Obligation, Due within Two Years | 9
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 | 10
Unrecorded Unconditional Purchase Obligation, Due after Five Years | 191
Commitments [Member] |
Unrecorded Unconditional Purchase Obligation [Line Items] |
Unrecorded Unconditional Purchase Obligation | 2,966
Unrecorded Unconditional Purchase Obligation, Due within One Year | 1,077
Unrecorded Unconditional Purchase Obligation, Due within Two Years | 339
Unrecorded Unconditional Purchase Obligation, Due within Three Years | 247
Unrecorded Unconditional Purchase Obligation, Due within Four Years | 160
Unrecorded Unconditional Purchase Obligation, Due within Five Years | 157
Unrecorded Unconditional Purchase Obligation, Due after Five Years | $ 986

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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 + 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 + Details
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X
- 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 + Details
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X
- 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 + Details
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X
- 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 + Details
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X
- 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 + Details
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X
- 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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