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Commitments and Guarantees Unrecorded Unconditional Purchase Obligations (Details) $ in Millions | Dec. 31, 2019 USD ($)
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Capital Addition Purchase Commitments [Member] |
Unrecorded Unconditional Purchase Obligation [Line Items] |
Unrecorded Unconditional Purchase Obligation | $ 598
Unrecorded Unconditional Purchase Obligation, Due within One Year | 393
Unrecorded Unconditional Purchase Obligation, Due within Two Years | 130
Unrecorded Unconditional Purchase Obligation, Due within Three Years | 14
Unrecorded Unconditional Purchase Obligation, Due within Four Years | 4
Unrecorded Unconditional Purchase Obligation, Due within Five Years | 1
Unrecorded Unconditional Purchase Obligation, Due after Five Years | 56
Long-term Contract for Purchase of Electric Power [Domain] |
Unrecorded Unconditional Purchase Obligation [Line Items] |
Unrecorded Unconditional Purchase Obligation | 3,363
Unrecorded Unconditional Purchase Obligation, Due within One Year | 193
Unrecorded Unconditional Purchase Obligation, Due within Two Years | 189
Unrecorded Unconditional Purchase Obligation, Due within Three Years | 220
Unrecorded Unconditional Purchase Obligation, Due within Four Years | 219
Unrecorded Unconditional Purchase Obligation, Due within Five Years | 215
Unrecorded Unconditional Purchase Obligation, Due after Five Years | 2,327
Electric Transmission [Member] |
Unrecorded Unconditional Purchase Obligation [Line Items] |
Unrecorded Unconditional Purchase Obligation | 45
Unrecorded Unconditional Purchase Obligation, Due within One Year | 0
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 | 9
Unrecorded Unconditional Purchase Obligation, Due within Five Years | 9
Unrecorded Unconditional Purchase Obligation, Due after Five Years | 9
Public Utility Districts [Member] |
Unrecorded Unconditional Purchase Obligation [Line Items] |
Unrecorded Unconditional Purchase Obligation | 119
Unrecorded Unconditional Purchase Obligation, Due within One Year | 16
Unrecorded Unconditional Purchase Obligation, Due within Two Years | 15
Unrecorded Unconditional Purchase Obligation, Due within Three Years | 13
Unrecorded Unconditional Purchase Obligation, Due within Four Years | 13
Unrecorded Unconditional Purchase Obligation, Due within Five Years | 12
Unrecorded Unconditional Purchase Obligation, Due after Five Years | 50
Natural gas [Member] |
Unrecorded Unconditional Purchase Obligation [Line Items] |
Unrecorded Unconditional Purchase Obligation | 827
Unrecorded Unconditional Purchase Obligation, Due within One Year | 59
Unrecorded Unconditional Purchase Obligation, Due within Two Years | 45
Unrecorded Unconditional Purchase Obligation, Due within Three Years | 40
Unrecorded Unconditional Purchase Obligation, Due within Four Years | 38
Unrecorded Unconditional Purchase Obligation, Due within Five Years | 42
Unrecorded Unconditional Purchase Obligation, Due after Five Years | 603
Coal and transportationSupply Agreements [Member] |
Unrecorded Unconditional Purchase Obligation [Line Items] |
Unrecorded Unconditional Purchase Obligation | 162
Unrecorded Unconditional Purchase Obligation, Due within One Year | 27
Unrecorded Unconditional Purchase Obligation, Due within Two Years | 27
Unrecorded Unconditional Purchase Obligation, Due within Three Years | 27
Unrecorded Unconditional Purchase Obligation, Due within Four Years | 27
Unrecorded Unconditional Purchase Obligation, Due within Five Years | 27
Unrecorded Unconditional Purchase Obligation, Due after Five Years | 27
Commitments [Member] |
Unrecorded Unconditional Purchase Obligation [Line Items] |
Unrecorded Unconditional Purchase Obligation | 5,114
Unrecorded Unconditional Purchase Obligation, Due within One Year | 688
Unrecorded Unconditional Purchase Obligation, Due within Two Years | 415
Unrecorded Unconditional Purchase Obligation, Due within Three Years | 323
Unrecorded Unconditional Purchase Obligation, Due within Four Years | 310
Unrecorded Unconditional Purchase Obligation, Due within Five Years | 306
Unrecorded Unconditional Purchase Obligation, Due after Five Years | $ 3,072

X
- 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. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 440 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=77896938&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 next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 440 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=77896938&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 fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 440 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=77896938&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. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 440 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=77896938&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. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 440 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=77896938&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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 440 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=77896938&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. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 440 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=77896938&loc=d3e25336-109308 + Details
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