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Investments In and Advances To Affiliates (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2021 | Mar. 31, 2021 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Jun. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Nov. 01, 2021 | Jun. 30, 2021
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |
Revenue | $ 3,036 |  | $ 2,545 |  |  |  | $ 8,371 | $ 7,100 |  |
Operating margin (loss) | 760 |  | 756 |  |  |  | 2,152 | 1,787 |  |
Gain (Loss) on Disposition of Business | $ 22 |  | (90) |  |  |  | $ 81 | (117) |  |
Equity Method Investment, Ownership Percentage | 10.00% |  |  |  |  |  | 10.00% |  |  |
Income (Loss) from Equity Method Investments | $ 25 |  | $ (112) |  |  |  | $ (15) | (106) |  |
Contributions and loans to equity affiliates |  |  |  |  |  |  | 321 | 286 |  |
Qatar Investment Authority |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage Sold |  |  |  |  |  |  |  |  |  | 13.60%
Qatar Investment Authority |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |
Equity Method Investment, Purchase Price Agreement |  |  |  |  |  |  | 125 |  |  |
Majority Owned Affiliate [Member] |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  | 1 | 1 |  |
Operating margin (loss) |  |  |  |  |  |  | 0 | (2) |  |
Net Income (Loss), Including Portion Attributable to Nonredeemable Noncontrolling Interest |  |  |  |  |  |  | (4) | (3) |  |
Minority Owned Affiliates [Member] |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  | 866 | 1,404 |  |
Operating margin (loss) |  |  |  |  |  |  | 45 | 203 |  |
Net Income (Loss), Including Portion Attributable to Nonredeemable Noncontrolling Interest |  |  |  |  |  |  | (108) | $ (444) |  |
OPGC [Member] |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |
Equity Method Investments, Fair Value Disclosure |  |  |  |  | $ 152 |  |  |  |  |
Equity Method Investment OTTI |  |  |  | $ 158 | $ 43 | $ 201 |  |  |  |
Equity Method Investment, Ownership Percentage |  |  | 49.00% |  |  |  |  | 49.00% |  |
sPower [Member] |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |
Business Combination, Consideration Transferred |  |  |  |  |  |  | $ 102 |  |  |
Fluence [Member] |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage | 43.20% |  |  |  |  |  | 43.20% |  |  | 50.00%
Equity Method Investment, Realized Gain (Loss) on Disposal (less than) |  |  |  |  |  |  | $ 60 |  |  |
Guacolda [Member] |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |
Equity Method Investment, Purchase Price Agreement |  | $ 34 |  |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage |  |  |  |  |  |  |  |  |  | 50.00%
Equity Method Investment, Realized Gain (Loss) on Disposal (less than) | $ 34 |  |  |  |  |  |  |  |  |
Equity Method Investment Long Lived Asset Impairment |  |  | $ 127 |  |  |  |  |  |  |
Uplight [Member] |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage | 30.60% |  |  |  |  |  | 30.60% |  |  | 32.30%
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable |  |  |  |  |  |  | $ 37 |  |  |
Business Combination, Step Acquisition, Equity Interest in Acquiree, Remeasurement Loss |  |  |  |  |  |  | $ 11 |  |  |
Grupo Energía Gas Panamá |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage | 49.00% |  |  |  |  |  | 49.00% |  |  |
Payments to Acquire Equity Method Investments |  |  |  |  |  |  | $ 21 |  |  |
Subsequent Event [Member] | Fluence [Member] |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage |  |  |  |  |  |  |  |  | 34.20% |

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