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Summary of Significant Accounting Policies (Noncontrolling Interest) (Details) $ in Millions |  |  | 12 Months Ended
--- | --- | --- | ---
Sep. 08, 2021 USD ($) | Jan. 28, 2021 USD ($) closing | Dec. 31, 2021 USD ($) | [1] | Dec. 31, 2019 USD ($) asset
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |  |  |
Sale of noncontrolling interest |  |  | $ 999 | $ 407 | [2]
Noncontrolling Interests |  |  |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |  |  |
Sale of noncontrolling interest |  |  | $ 454 | 863 | [2]
Noncontrolling Interests | Renewables |  |  |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |  |  |
Value of sale of parent interest |  |  |  | 415 |
Ownership interest change |  |  |  | 466 |
Tax benefit from sale of interest |  |  |  | $ 8 |
Noncontrolling Interests | Wind and Solar Storage |  |  |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |  |  |
Percentage sold |  |  |  | 49.00% |
Number of assets sold | asset |  |  |  | 37 |
Noncontrolling Interests | Operating Solar Assets |  |  |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |  |  |
Percentage sold |  |  |  | 33.00% |
Number of assets sold | asset |  |  |  | 11 |
Noncontrolling Interests | Duke Energy Indiana |  |  |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |  |  |
Value of sale of parent interest | $ 1,025 |  |  |  |
Percentage sold |  | 19.90% |  |  |
Number of closings | closing |  | 2 |  |  |
Ownership interest sold | 11.05% |  |  |  |
Proceed of purchase price for exchange in interest | 50.00% | 50.00% |  |  |
Transaction costs | $ 27 |  |  |  |
Sale of noncontrolling interest | $ 545 |  |  |  |
Noncontrolling Interests | Duke Energy Indiana |  |  |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |  |  |
Value of sale of parent interest |  | $ 2,000 |  |  |
Percentage sold |  | 19.90% |  |  |
[1] | Relates to the sale of a noncontrolling interest in Duke Energy Indiana. See Note 1 for additional discussion
[2] | Relates to the sale of a noncontrolling interest in the Commercial Renewables segment. See Note 1 for additional discussion of the transaction.

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