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Variable Interest Entities - Additional Information (Details) - Clean Energy Businesses - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Variable Interest Entity [Line Items] |  |  |  |
Equity method investments |  | $ 11 |  | $ 11
Variable Interest Entity, Primary Beneficiary | CED Nevada Virginia |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Income (loss) before tax |  |  | $ 39 |
Net income (loss) |  |  | 29 |
Variable Interest Entity, Primary Beneficiary | Tax Equity Projects |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Income (loss) before tax | $ 18 |  | 28 | 13
Net income (loss) | 13 |  | 21 | 10
Variable Interest Entity, Primary Beneficiary | Tax Equity Investors | CED Nevada Virginia |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Income (loss) before tax |  | 53 | (42) | 53
Net income (loss) |  | (40) | (32) | 40
Variable Interest Entity, Primary Beneficiary | Tax Equity Investors | Tax Equity Projects |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Income (loss) before tax | (1) | 6 | (7) | 8
Net income (loss) | $ (1) | 5 | $ (5) | $ 6
Variable Interest Entity, Primary Beneficiary | Con Edison Development | Tax Equity Projects |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Income (loss) before tax |  | 10 |  |
Net income (loss) |  | $ 7 |  |
Percentage of variable interests (less than) |  |  | 100.00% |

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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 https://asc.fasb.org/extlink&oid=109237563&loc=d3e33749-111570 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(10)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 25 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8813-108599 + Details
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- Definition Description of the amount of pre-tax income (loss) derived by the reporting entity from the Variable Interest Entity (VIE). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph d -URI https://asc.fasb.org/extlink&oid=123419778&loc=d3e5747-111685 + Details
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- Definition Percentage of the Variable Interest Entity's (VIE) voting interest owned by (or beneficial interest in) the reporting entity (directly or indirectly). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 5A -Subparagraph (d) -URI https://asc.fasb.org/extlink&oid=123419778&loc=SL6759159-111685 + Details
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