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Investments In and Advances To Affiliates - Summarized Financial Information (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue | $ 2,560 | $ 2,545 | $ 2,217 | $ 2,338 | $ 2,431 | $ 2,625 | $ 2,483 | $ 2,650 | $ 9,660 | $ 10,189 | $ 10,736
Operating margin | 906 | 756 | 524 | 507 | 560 | 701 | 502 | 586 | 2,693 | 2,349 | 2,573
Net income | 401 | $ (481) | $ 3 | $ 229 | (120) | $ 298 | $ 67 | $ 233 | 152 | 478 | 1,565
Assets, Current | 5,414 |  |  |  | 5,231 |  |  |  | 5,414 | 5,231 |
Liabilities, Current | 5,362 |  |  |  | 5,096 |  |  |  | 5,362 | 5,096 |
Liabilities, Noncurrent | 23,649 |  |  |  | 22,435 |  |  |  | 23,649 | 22,435 |
Stockholders' Equity Attributable to Parent | 2,634 |  |  |  | 2,996 |  |  |  | 2,634 | 2,996 |
Undistributed Earnings Of Minority Owned Affiliates Included In Retained Earnings | 120 |  |  |  |  |  |  |  | 120 |  |
Distributions Received From Minority Owned Affiliates |  |  |  |  |  |  |  |  | 14 | 23 | 83
Basis Difference Between Carrying Amount And Investment | 150 |  |  |  |  |  |  |  | 150 |  |
Minority Owned Affiliates |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 1,880 | 1,122 | 962
Operating margin |  |  |  |  |  |  |  |  | 213 | 124 | 135
Net income |  |  |  |  |  |  |  |  | (538) | (724) | 14
Assets, Current | 1,017 |  |  |  | 831 |  |  |  | 1,017 | 831 |
Assets, Noncurrent | 6,230 |  |  |  | 7,220 |  |  |  | 6,230 | 7,220 |
Liabilities, Current | 1,294 |  |  |  | 1,271 |  |  |  | 1,294 | 1,271 |
Liabilities, Noncurrent | 3,671 |  |  |  | 3,966 |  |  |  | 3,671 | 3,966 |
Stockholders' Equity Attributable to Parent | 2,282 |  |  |  | 2,814 |  |  |  | 2,282 | 2,814 |
Majority Owned Affiliates |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 1 | 49 | 40
Operating margin |  |  |  |  |  |  |  |  | (3) | (5) | 3
Net income |  |  |  |  |  |  |  |  | (4) | (7) | $ (3)
Assets, Current | 159 |  |  |  | 166 |  |  |  | 159 | 166 |
Assets, Noncurrent | 886 |  |  |  | 982 |  |  |  | 886 | 982 |
Liabilities, Current | 121 |  |  |  | 141 |  |  |  | 121 | 141 |
Liabilities, Noncurrent | 981 |  |  |  | 1,052 |  |  |  | 981 | 1,052 |
Stockholders' Equity Attributable to Parent | $ (57) |  |  |  | $ (45) |  |  |  | $ (57) | $ (45) |

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