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