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Investments Accounted for by the Equity Method and Variable Interest Entities - Summary of Equity Method Investments (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Nov. 30, 2020 | Dec. 31, 2019
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Investments Accounted for by the Equity Method |  |  |
Equity investments in affiliates | $ 346 |  | $ 388
Difference between carrying value and underlying net assets | 343 |  |
Undistributed earnings by equity investment | $ 30 |  | $ 42
Agua Caliente |  |  |
Investments Accounted for by the Equity Method |  |  |
Economic interest in equity method investments (as a percent) | 35.00% | 35.00% |
Equity investments in affiliates | $ 185 |  |
Gladstone |  |  |
Investments Accounted for by the Equity Method |  |  |
Economic interest in equity method investments (as a percent) | 37.50% |  |
Equity investments in affiliates | $ 131 |  |
Ivanpah Master Holdings, LLC |  |  |
Investments Accounted for by the Equity Method |  |  |
Economic interest in equity method investments (as a percent) | 54.50% |  |
Equity investments in affiliates | $ 17 |  |
Watson Cogeneration Company |  |  |
Investments Accounted for by the Equity Method |  |  |
Economic interest in equity method investments (as a percent) | 49.00% |  |
Equity investments in affiliates | $ 14 |  |
Midway-Sunset Cogeneration Company |  |  |
Investments Accounted for by the Equity Method |  |  |
Economic interest in equity method investments (as a percent) | 50.00% |  |
Equity investments in affiliates | $ 12 |  |
Petra Nova Parish Holdings |  |  |
Investments Accounted for by the Equity Method |  |  |
Economic interest in equity method investments (as a percent) | 50.00% |  |
Equity investments in affiliates | $ (13) |  |

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- Definition Difference between amount at which an investment accounted for under the equity method of accounting is carried (reported) on the balance sheet and amount of underlying equity in net assets the reporting Entity has in the investee. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571 + Details
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- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571 + Details
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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=120311839&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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- Definition Amount of consolidated retained earnings that represent undistributed (not yet received) earnings from 50% or less owned persons accounted for by the equity method (equity method investees). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 852 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6462270&loc=d3e57205-112772 + Details
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