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Investments In and Advances To Affiliates (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2021 | Jun. 30, 2021 | Jun. 30, 2020 | Mar. 31, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020 | Mar. 31, 2021
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |
Revenue |  | $ 2,700 | $ 2,217 |  | $ 5,335 | $ 4,555 |  |
Operating margin (loss) |  | 728 | 524 |  | 1,392 | 1,031 |  |
Gain (Loss) on Disposition of Business |  | $ 64 | (27) |  | $ 59 | (27) |  |
Equity Method Investment, Ownership Percentage |  | 10.00% |  |  | 10.00% |  |  |
Income (Loss) from Equity Method Investments |  | $ (10) | 8 |  | $ (40) | 6 |  |
Contributions and loans to equity affiliates |  |  |  |  | $ 173 | 178 |  |
Qatar Investment Authority |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage Sold |  | 13.60% |  |  | 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) |  |  |  |  | (1) | (1) |  |
Net Income (Loss), Including Portion Attributable to Nonredeemable Noncontrolling Interest |  |  |  |  | (2) | (2) |  |
Minority Owned Affiliates [Member] |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |
Revenue |  |  |  |  | 726 | 939 |  |
Operating margin (loss) |  |  |  |  | 12 | 153 |  |
Net Income (Loss), Including Portion Attributable to Nonredeemable Noncontrolling Interest |  |  |  |  | (93) | 11 |  |
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 |  |  |  |  | $ 104 |  |  |
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) |  | $ 61 |  |  |  |  |  |
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 Long Lived Asset Impairment |  |  |  |  |  |  | $ 127 |
Contributions and loans to equity affiliates |  | $ 10 |  |  |  |  |  |
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] | Guacolda [Member] |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |
Equity Method Investment, Amount Sold | $ 24 |  |  |  |  |  |  |

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