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Investments In and Advances To Affiliates (Details) - USD ($) $ in Millions |  | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Apr. 18, 2019 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019 | Jun. 22, 2020 | Jul. 01, 2019 | Mar. 31, 2019
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  | $ 2,545 |  |  | $ 2,625 | $ 7,100 | $ 7,758 |  |  |  |
Operating margin (loss) |  | 756 |  |  | 701 | 1,787 | 1,789 |  |  |  |
Gain (Loss) on Disposition of Business |  | (90) |  |  | 16 | (117) | 9 |  |  |  |
Income (Loss) from Equity Method Investments |  | $ (112) |  |  | $ 4 | (106) | 3 |  |  |  |
Minority Owned Affiliates [Member] |  |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  | 1,404 | 807 |  |  |  |
Operating margin (loss) |  |  |  |  |  | 203 | 87 |  |  |  |
Net Income (Loss), Including Portion Attributable to Nonredeemable Noncontrolling Interest |  |  |  |  |  | (444) | (65) |  |  |  |
Majority Owned Affiliate [Member] |  |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  | 1 | 12 |  |  |  |
Operating margin (loss) |  |  |  |  |  | (2) | (2) |  |  |  |
Net Income (Loss), Including Portion Attributable to Nonredeemable Noncontrolling Interest |  |  |  |  |  | (3) | (7) |  |  |  |
OPGC [Member] |  |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |  |
Equity Method Investments, Fair Value Disclosure |  |  |  | $ 152 |  |  |  | $ 212 |  |  |
Equity Method Investment OTTI |  |  | $ 158 | $ 43 |  | 201 |  | $ 92 |  |  |
Equity Method Investment, Ownership Percentage Sold |  |  |  |  |  |  |  |  | 49.00% |  |
sPower [Member] |  |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage Sold | 48.00% |  |  |  |  |  |  |  |  |  |
Proceeds from Sale of Equity Method Investments | $ 173 |  |  |  |  |  |  |  |  |  |
Reinvestment of Proceeds from Sale of Equity Method Investments | 58 |  |  |  |  | 0 | 58 |  |  |  |
Gain (Loss) on Disposition of Business | $ 28 |  |  |  |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage | 26.00% |  |  |  |  |  |  |  |  |  | 50.00%
Gain (Loss) on Investments |  |  |  |  |  |  | 12 |  |  |  |
Guacolda [Member] |  |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |  |
Equity Method Investment Long Lived Asset Impairment |  |  |  |  |  | 120 |  |  |  |  |
Unrecognized Equity Method Loss |  |  |  |  |  | $ 114 |  |  |  |  |
Energía Natural Dominicana Enadom [Member] |  |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |  |
Business Combination, Consideration Transferred |  |  |  |  |  |  | 55 |  |  |  |
Gain (Loss) on Investments |  |  |  |  |  |  | 2 |  |  |  |
Uplight [Member] |  |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |  |
Business Combination, Consideration Transferred |  |  |  |  |  |  | $ 53 |  |  |  |
Investments in and Advances to Affiliates, at Fair Value |  |  |  |  |  |  |  |  |  | $ 98 |

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