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Commitments and Contingencies - Certain Fuel, Transportation and Purchased Energy Commitments (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Coal, Gas and Transportation Commitments |  |  |
Commitments and Contingencies |  |  |
Purchases under coal, gas and transportation arrangement | $ 736 | $ 584 | $ 479
Minimum purchase commitment |  |  |
2023 | 110 |  |
2024 | 71 |  |
2025 | 83 |  |
2026 | 54 |  |
2027 | 78 |  |
Thereafter | 56 |  |
Total | 452 |  |
Purchases under energy contracts | 736 | 584 | 479
Renewable Purchased Power Agreements |  |  |
Commitments and Contingencies |  |  |
Purchases under coal, gas and transportation arrangement | 18,800 | 12,800 | 1,800
Minimum purchase commitment |  |  |
2023 | 908 |  |
2024 | 1,050 |  |
2025 | 662 |  |
2026 | 396 |  |
2027 | 296 |  |
Thereafter | 987 |  |
Total | 4,299 |  |
Purchases under energy contracts | 18,800 | $ 12,800 | $ 1,800
Short-term commitments | $ 1,500 |  |

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- Definition Amount of fixed and determinable portion of unrecorded unconditional purchase obligation to be paid in fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 440 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=123406679&loc=d3e25336-109308 + Details
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- Definition Amount of fixed and determinable portion of unrecorded unconditional purchase obligation to be paid in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 440 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=123406679&loc=d3e25336-109308 + Details
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- Definition Amount of fixed and determinable portion of unrecorded unconditional purchase obligation to be paid in fourth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 440 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=123406679&loc=d3e25336-109308 + Details
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