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Commitments (Long-Term Purchase Commitments) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Electricity Purchase Contracts |  |  |
Long-Term Purchase Commitment [Line Items] |  |  |
Purchases Under Long Term Contracts | $ 756 | $ 1,597 | $ 827
Purchase Obligation, Due in Next Twelve Months | 700 |  |
Purchase Obligation, Due in Second Year | 500 |  |
Purchase Obligation, Due in Third Year | 447 |  |
Purchase Obligation, Due in Fourth Year | 434 |  |
Purchase Obligation, Due in Fifth Year | 434 |  |
Future Commitments Thereafter | 5,037 |  |
Future Commitments Total | 7,552 |  |
Fuel Purchase Contracts |  |  |
Long-Term Purchase Commitment [Line Items] |  |  |
Purchases Under Long Term Contracts | 1,573 | 1,824 | 1,838
Purchase Obligation, Due in Next Twelve Months | 1,370 |  |
Purchase Obligation, Due in Second Year | 815 |  |
Purchase Obligation, Due in Third Year | 609 |  |
Purchase Obligation, Due in Fourth Year | 495 |  |
Purchase Obligation, Due in Fifth Year | 457 |  |
Future Commitments Thereafter | 1,445 |  |
Future Commitments Total | 5,191 |  |
Other Purchase Contracts |  |  |
Long-Term Purchase Commitment [Line Items] |  |  |
Purchases Under Long Term Contracts | 1,506 | $ 1,684 | $ 1,671
Purchase Obligation, Due in Next Twelve Months | 1,904 |  |
Purchase Obligation, Due in Second Year | 636 |  |
Purchase Obligation, Due in Third Year | 605 |  |
Purchase Obligation, Due in Fourth Year | 570 |  |
Purchase Obligation, Due in Fifth Year | 526 |  |
Future Commitments Thereafter | 1,816 |  |
Future Commitments Total | $ 6,057 |  |

X
- Definition The total minimum amount the entity agreed to spend under the long-term purchase commitment + References No definition available. + Details
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X
- Definition The actual amount the entity purchased under the long-term purchase commitment + References No definition available. + Details
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- Definition The minimum amount the entity agreed to spend under the long-term purchase commitment, which payments are due after the fifth year following the balance sheet date + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Amount of purchase arrangement to be paid in fifth fiscal year following current fiscal year. Includes, but is not limited to, recorded and unrecorded purchase obligations, long-term purchase commitment, and short-term purchase commitment. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References No definition available. + Details
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- Definition Amount of purchase arrangement to be paid in fourth fiscal year following current fiscal year. Includes, but is not limited to, recorded and unrecorded purchase obligations, long-term purchase commitment, and short-term purchase commitment. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References No definition available. + Details
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X
- Definition Amount of purchase arrangement to be paid in next fiscal year following current fiscal year. Includes, but is not limited to, recorded and unrecorded purchase obligations, long-term purchase commitment, and short-term purchase commitment. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References No definition available. + Details
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- Definition Amount of purchase arrangement to be paid in second fiscal year following current fiscal year. Includes, but is not limited to, recorded and unrecorded purchase obligations, long-term purchase commitment, and short-term purchase commitment. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References No definition available. + Details
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- Definition Amount of purchase arrangement to be paid in third fiscal year following current fiscal year. Includes, but is not limited to, recorded and unrecorded purchase obligations, long-term purchase commitment, and short-term purchase commitment. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References No definition available. + Details
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