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Variable Interest Entities (Narrative) (Details) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2021 USD ($) MW | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Variable Interest Entity [Line Items] |  |  |
Investments | $ 71 | $ 70 | $ 71
Variable Interest Entity, Primary Beneficiary | Aviator Wind |  |  |
Variable Interest Entity [Line Items] |  |  |
Ownership interest | 51.00% |  |
Nameplate capacity (in MW) | MW | 525 |  |
Variable Interest Entity, Primary Beneficiary | Aviator Wind Class B Membership |  |  |
Variable Interest Entity [Line Items] |  |  |
Noncontrolling ownership interest | 49.00% |  |
Variable Interest Entity, Not Primary Beneficiary |  |  |
Variable Interest Entity [Line Items] |  |  |
Investments | $ 71 | $ 70 |
Variable Interest Entity, Not Primary Beneficiary | T.E.S. Filer City |  |  |
Variable Interest Entity [Line Items] |  |  |
Ownership interest | 50.00% |  |
Variable Interest Entity, Not Primary Beneficiary | Grayling |  |  |
Variable Interest Entity [Line Items] |  |  |
Ownership interest | 50.00% |  |
Variable Interest Entity, Not Primary Beneficiary | Genesee |  |  |
Variable Interest Entity [Line Items] |  |  |
Ownership interest | 50.00% |  |
Variable Interest Entity, Not Primary Beneficiary | Craven |  |  |
Variable Interest Entity [Line Items] |  |  |
Ownership interest | 50.00% |  |

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- Definition This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=109237563&loc=d3e33749-111570 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 25 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e8813-108599 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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