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Variable Interest Entities (Consolidated Information of Variable Interest Entity) (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Variable Interest Entity [Line Items] |  |  |
Cash and cash equivalents | $ 168 | $ 140 |
Accounts receivable | 863 | 886 |
Prepayments and other current assets | 112 | 86 |
Plant, property, and equipment, net | 21,039 | 18,926 |
Total Assets | 29,666 | 26,837 | $ 24,529
Accounts payable | 671 | 622 |
Asset retirement obligations | 553 | $ 477 |
Variable Interest Entity, Primary Beneficiary |  |  |
Variable Interest Entity [Line Items] |  |  |
Cash and cash equivalents | 7 |  |
Accounts receivable | 5 |  |
Prepayments and other current assets | 1 |  |
Plant, property, and equipment, net | 692 |  |
Total Assets | 705 |  |
Accounts payable | 3 |  |
Asset retirement obligations | 19 |  |
Total liabilities | $ 22 |  |

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