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Investments In and Advances To Affiliates (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Dec. 31, 2019
Investments in and Advances to Affiliates [Line Items] |  |  |
Revenue | $ 2,338 | $ 2,650 |
Operating margin | 507 | 586 |
Gain (Loss) on Disposition of Business | 0 | (4) |
Income (Loss) from Equity Method Investments | (2) | (6) |
Minority Owned Affiliates [Member] |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |
Revenue | 370 | 214 |
Operating margin | 55 | 11 |
Net Income (Loss), Including Portion Attributable to Nonredeemable Noncontrolling Interest | (11) | $ (21) |
OPGC [Member] |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |
Equity Method Investments, Fair Value Disclosure | 152 |  | $ 212
Equity Method Investment OTTI | $ 43 |  | $ 92

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