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Investments In and Advances To Affiliates (Details) - USD ($) $ in Millions |  | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Apr. 18, 2019 | Jun. 30, 2020 | Mar. 31, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019 | Jun. 22, 2020 | Mar. 31, 2019
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |
Revenue |  | $ 2,217 |  | $ 2,483 | $ 4,555 | $ 5,133 |  |  |
Operating margin |  | 524 |  | 502 | 1,031 | 1,088 |  |  |
Gain (Loss) on Disposition of Business |  | (27) |  | (3) | (27) | (7) |  |  |
Income (Loss) from Equity Method Investments |  | 8 |  | $ 5 | 6 | (1) |  |  |
Minority Owned Affiliates [Member] |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  | 939 | 481 |  |  |
Operating margin |  |  |  |  | 153 | 55 |  |  |
Net Income (Loss), Including Portion Attributable to Nonredeemable Noncontrolling Interest |  |  |  |  | 11 | (30) |  |  |
Majority Owned Affiliate [Member] |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  | 1 | 43 |  |  |
Operating margin |  |  |  |  | (1) | (1) |  |  |
Net Income (Loss), Including Portion Attributable to Nonredeemable Noncontrolling Interest |  |  |  |  | (2) | (6) |  |  |
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%

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