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Fair Value Measurements (Fair Value of Note Payable and Long-Term Debt) (Detail) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis |  |
Fair value of note payable | $ 25 | $ 50
Total | 868 | 885
6.900% Senior Debentures, Due 2028 |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis |  |
Fair value of senior debt | $ 29 | $ 29
Interest rate | 6.90% | 6.90%
6.920% Senior Debentures, Due 2028 |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis |  |
Fair value of senior debt | $ 420 | $ 418
Interest rate | 6.92% | 6.92%
6.125% Senior Notes, Due 2034 |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis |  |
Fair value of senior debt | $ 394 | $ 388
Interest rate | 6.125% | 6.125%
Level 1 |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis |  |
Fair value of note payable | $ 0 | $ 0
Total | 0 | 0
Level 1 | 6.900% Senior Debentures, Due 2028 |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis |  |
Fair value of senior debt | 0 | 0
Level 1 | 6.920% Senior Debentures, Due 2028 |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis |  |
Fair value of senior debt | 0 | 0
Level 1 | 6.125% Senior Notes, Due 2034 |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis |  |
Fair value of senior debt | 0 | 0
Level 2 |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis |  |
Fair value of note payable | 25 | 50
Total | 868 | 885
Level 2 | 6.900% Senior Debentures, Due 2028 |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis |  |
Fair value of senior debt | 29 | 29
Level 2 | 6.920% Senior Debentures, Due 2028 |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis |  |
Fair value of senior debt | 420 | 418
Level 2 | 6.125% Senior Notes, Due 2034 |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis |  |
Fair value of senior debt | 394 | 388
Level 3 |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis |  |
Fair value of note payable | 0 | 0
Total | 0 | 0
Level 3 | 6.900% Senior Debentures, Due 2028 |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis |  |
Fair value of senior debt | 0 | 0
Level 3 | 6.920% Senior Debentures, Due 2028 |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis |  |
Fair value of senior debt | 0 | 0
Level 3 | 6.125% Senior Notes, Due 2034 |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis |  |
Fair value of senior debt | $ 0 | $ 0

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