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Investments In and Advances To Affiliates - Summarized Financial Information (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2019 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Jan. 01, 2018
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  | $ 2,431 | $ 2,625 | $ 2,483 | $ 2,650 | $ 2,622 | $ 2,837 | $ 2,537 | $ 2,740 | $ 10,189 | $ 10,736 | $ 10,530 |
Operating margin |  | 560 | 701 | 502 | 586 | 646 | 671 | 600 | 656 | 2,349 | 2,573 | 2,465 |
Net income (loss) |  | (120) | $ 298 | $ 67 | $ 233 | 181 | $ 191 | $ 416 | $ 777 | 478 | 1,565 | (777) |
Assets, Current |  | 5,231 |  |  |  | 5,015 |  |  |  | 5,231 | 5,015 |  |
Liabilities, Current |  | 5,096 |  |  |  | 4,399 |  |  |  | 5,096 | 4,399 |  |
Liabilities, Noncurrent |  | 22,435 |  |  |  | 21,639 |  |  |  | 22,435 | 21,639 |  |
Stockholders' Equity Attributable to Noncontrolling Interest |  | 2,233 |  |  |  | 2,396 |  |  |  | 2,233 | 2,396 | 2,380 | $ 2,461
Stockholders' Equity Attributable to Parent |  | 2,996 |  |  |  | 3,208 |  |  |  | 2,996 | 3,208 |  |
Undistributed Earnings Of Minority Owned Affiliates Included In Retained Earnings |  | 14 |  |  |  |  |  |  |  | 14 |  |  |
Distributions Received From Minority Owned Affiliates |  |  |  |  |  |  |  |  |  | 23 | 83 | 69 |
Basis Difference Between Carrying Amount And Investment |  | 225 |  |  |  |  |  |  |  | 225 |  |  |
Minority Owned Affiliates |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  | 1,122 | 962 | 762 |
Operating margin |  |  |  |  |  |  |  |  |  | 124 | 135 | 165 |
Net income (loss) |  |  |  |  |  |  |  |  |  | (724) | 14 | 72 |
Assets, Current |  | 831 |  |  |  | 558 |  |  |  | 831 | 558 |  |
Assets, Noncurrent |  | 7,220 |  |  |  | 5,918 |  |  |  | 7,220 | 5,918 |  |
Liabilities, Current |  | 1,271 |  |  |  | 546 |  |  |  | 1,271 | 546 |  |
Liabilities, Noncurrent |  | 3,966 |  |  |  | 3,309 |  |  |  | 3,966 | 3,309 |  |
Stockholders' Equity Attributable to Parent |  | 2,814 |  |  |  | 2,622 |  |  |  | 2,814 | 2,622 |  |
Majority Owned Affiliates |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  | 49 | 40 | 16 |
Operating margin |  |  |  |  |  |  |  |  |  | (5) | 3 | 5 |
Net income (loss) |  |  |  |  |  |  |  |  |  | (7) | (3) | $ (15) |
Assets, Current |  | 166 |  |  |  | 89 |  |  |  | 166 | 89 |  |
Assets, Noncurrent |  | 982 |  |  |  | 41 |  |  |  | 982 | 41 |  |
Liabilities, Current |  | 141 |  |  |  | 35 |  |  |  | 141 | 35 |  |
Liabilities, Noncurrent |  | 1,052 |  |  |  | 122 |  |  |  | 1,052 | 122 |  |
Stockholders' Equity Attributable to Parent |  | (45) |  |  |  | $ (27) |  |  |  | (45) | $ (27) |  |
Gas Natural del Este [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Noncash or Part Noncash Divestiture, Amount of Consideration Received | $ 55 |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Inputs, Level 3 [Member] | Long Lived Assets Held For Sale [Member] | OPGC Affiliate [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Assets Carrying Amount Disclosure Nonrecurring |  | $ 212 |  |  |  |  |  |  |  | $ 212 |  |  |

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