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Debt And Related Expenses (Narrative) (Details) $ in Millions |  | 12 Months Ended
--- | --- | ---
Aug. 01, 2023 USD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($)
Debt Instrument [Line Items] |  |  |  |
Repayments of Long-term Debt |  | $ 242 | $ 0 | $ 1,243
Early retirement of debt |  | 0 | 0 | 30
Charge on early retirement of debt, cash retirement costs |  | 0 | $ 0 | 59
Credit Facility, Commitment Fee |  | 5 |  |
Commercial paper |  | 0 |  |
Commercial Paper [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Credit Facility, borrowing capacity |  | 3,000 |  |
Senior Credit Facility [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Credit Facility, borrowing capacity |  | 3,000 |  |
Outstanding credit facility borrowings |  | 0 |  |
Outstanding letters of credit |  | $ 3 |  |
Debt-to-capitalization ratio |  | 0.22 |  |
Senior Credit Facility [Member] | Maximum [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt-to-capitalization ratio |  | 0.65 |  |
Senior Notes [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Repayments of Long-term Debt |  |  |  | 1,200
Early retirement of debt |  |  |  | 30
Charge on early retirement of debt, cash retirement costs |  |  |  | 59
Charge on early retirement of debt, noncash charges |  |  |  | $ 89
8.25% due August 1, 2023 [Member] | Senior Notes [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Repayments of Long-term Debt | $ 242 |  |  |
Debt interest rate, stated percentage | 8.25% |  |  |

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