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Charges and Credits - Summary of Charges and Credits (Detail) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2024 | Sep. 30, 2024 | Jun. 30, 2024 | Mar. 31, 2024 | Dec. 31, 2023 | Mar. 31, 2023 | Dec. 31, 2022 | Jun. 30, 2022 | Mar. 31, 2022 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Charges And Credits [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Charges and credits, Pretax Charge (Credit) |  |  |  |  |  |  |  |  |  | $ 541 | $ 110 | $ (347)
Charges and credits, Tax Benefit (Expense) |  |  |  |  |  |  |  |  |  | 87 |  | (44)
Charges and credits, Noncontrolling Interests |  |  |  |  |  |  |  |  |  | 27 | 8 |
Charges and credits, Net |  |  |  |  |  |  |  |  |  | $ 427 | $ 102 | $ (303)
Interest And Other | Gain On Sale Of Liberty Shares |  |  |  |  |  |  |  |  |  |  |  |
Charges And Credits [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Charges and credits, Pretax Charge (Credit) |  |  |  |  |  | $ (36) | $ (84) | $ (215) | $ (26) |  |  |
Charges and credits, Tax Benefit (Expense) |  |  |  |  |  | (8) | (19) | (14) | (4) |  |  |
Charges and credits, Net |  |  |  |  |  | $ (28) | (65) | (201) | $ (22) |  |  |
Interest And Other | Asset impairments |  |  |  |  |  |  |  |  |  |  |  |
Charges And Credits [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Charges and credits, Pretax Charge (Credit) | $ 162 |  |  |  |  |  |  |  |  |  |  |
Charges and credits, Tax Benefit (Expense) | 23 |  |  |  |  |  |  |  |  |  |  |
Charges and credits, Net | 139 |  |  |  |  |  |  |  |  |  |  |
Interest And Other | Merger And Integration |  |  |  |  |  |  |  |  |  |  |  |
Charges And Credits [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Charges and credits, Pretax Charge (Credit) | 63 | $ 47 | $ 31 | $ 25 | $ 56 |  |  |  |  |  |  |
Charges and credits, Tax Benefit (Expense) | 6 | 10 | 5 | 6 | 8 |  |  |  |  |  |  |
Charges and credits, Noncontrolling Interests | 7 | 7 | 8 | 5 | 8 |  |  |  |  |  |  |
Charges and credits, Net | 50 | 30 | 18 | $ 14 | 40 |  |  |  |  |  |  |
Interest And Other | Gain on sale of investment |  |  |  |  |  |  |  |  |  |  |  |
Charges And Credits [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Charges and credits, Pretax Charge (Credit) | (24) |  |  |  |  |  |  |  |  |  |  |
Charges and credits, Net | (24) |  |  |  |  |  |  |  |  |  |  |
Interest And Other | Currency Devaluation Loss in Argentina |  |  |  |  |  |  |  |  |  |  |  |
Charges And Credits [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Charges and credits, Pretax Charge (Credit) |  |  |  |  | 90 |  |  |  |  |  |  |
Charges and credits, Net |  |  |  |  | $ 90 |  |  |  |  |  |  |
Interest And Other | Gain On Sale Of Real Estate |  |  |  |  |  |  |  |  |  |  |  |
Charges And Credits [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Charges and credits, Pretax Charge (Credit) |  |  |  |  |  |  |  | (43) |  |  |  |
Charges and credits, Tax Benefit (Expense) |  |  |  |  |  |  |  | (2) |  |  |  |
Charges and credits, Net |  |  |  |  |  |  |  | $ (41) |  |  |  |
Interest And Other | Loss On Blue Chip Swap Transactions |  |  |  |  |  |  |  |  |  |  |  |
Charges And Credits [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Charges and credits, Pretax Charge (Credit) |  |  |  |  |  |  | 139 |  |  |  |  |
Charges and credits, Net |  |  |  |  |  |  | 139 |  |  |  |  |
Interest And Other | Gain On ADC Equity Investment |  |  |  |  |  |  |  |  |  |  |  |
Charges And Credits [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Charges and credits, Pretax Charge (Credit) |  |  |  |  |  |  | (107) |  |  |  |  |
Charges and credits, Tax Benefit (Expense) |  |  |  |  |  |  | (3) |  |  |  |  |
Charges and credits, Net |  |  |  |  |  |  | (104) |  |  |  |  |
Interest And Other | Gain On Repurchase Of Bonds |  |  |  |  |  |  |  |  |  |  |  |
Charges And Credits [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Charges and credits, Pretax Charge (Credit) |  |  |  |  |  |  | (11) |  |  |  |  |
Charges and credits, Tax Benefit (Expense) |  |  |  |  |  |  | (2) |  |  |  |  |
Charges and credits, Net |  |  |  |  |  |  | $ (9) |  |  |  |  |
Interest And Other | Workforce reductions |  |  |  |  |  |  |  |  |  |  |  |
Charges And Credits [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Charges and credits, Pretax Charge (Credit) | 61 | 65 | 111 |  |  |  |  |  |  |  |  |
Charges and credits, Tax Benefit (Expense) | 10 | 10 | 17 |  |  |  |  |  |  |  |  |
Charges and credits, Net | $ 51 | $ 55 | $ 94 |  |  |  |  |  |  |  |  |

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