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Commitments and Contingencies - Transportation and Purchased Power Commitments (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Coal, Gas and Transportation Commitments |  |  |
Commitments and Contingencies |  |  |
Purchases under coal, gas and transportation arrangement | $ 800 | $ 1,200 | $ 1,200
Minimum purchase commitment |  |  |
2021 | 146 |  |
2022 | 98 |  |
2023 | 69 |  |
2024 | 67 |  |
2025 | 65 |  |
Thereafter | 80 |  |
Total | 525 |  |
Purchases under power contracts | 800 | 1,200 | 1,200
Renewable Purchased Power Agreements |  |  |
Commitments and Contingencies |  |  |
Purchases under coal, gas and transportation arrangement | 142 | 183 | 138
Minimum purchase commitment |  |  |
2021 | 48 |  |
2022 | 62 |  |
2023 | 50 |  |
2024 | 50 |  |
2025 | 49 |  |
Thereafter | 316 |  |
Total | 575 |  |
Purchases under power contracts | $ 142 | $ 183 | $ 138

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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 http://asc.fasb.org/extlink&oid=121559207&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 http://asc.fasb.org/extlink&oid=121559207&loc=d3e25336-109308 + Details
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