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Charges and Credits - Summary of Charges and Credits (Detail) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Jun. 30, 2022 | Mar. 31, 2022 | Sep. 30, 2022
Charges And Credits [Line Items] |  |  |  |
Charges and credits, Pretax Credit |  |  |  | $ 285,000,000
Charges and credits, Tax Expense |  |  |  | 19,000,000
Charges and credits, Net | $ 0 |  |  | $ 266,000,000
Interest And Other | Gain On Sale Of Liberty Shares |  |  |  |
Charges And Credits [Line Items] |  |  |  |
Charges and credits, Pretax Credit |  | $ 216,000,000 | $ 26,000,000 |
Charges and credits, Tax Expense |  | 13,000,000 | 4,000,000 |
Charges and credits, Net |  | 203,000,000 | $ 22,000,000 |
Interest And Other | Gain On Sale Of Real Estate |  |  |  |
Charges And Credits [Line Items] |  |  |  |
Charges and credits, Pretax Credit |  | 43,000,000 |  |
Charges and credits, Tax Expense |  | 2,000,000 |  |
Charges and credits, Net |  | $ 41,000,000 |  |

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