Charges and Credits - Summary of Charges and Credits (Detail) - USD ($) $ in Millions	3 Months Ended							12 Months Ended
	Dec. 31, 2023	Mar. 31, 2023	Dec. 31, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Sep. 30, 2021	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Charges And Credits [Line Items]
Charges and credits, Pretax Charge (Credit)								$ 110
Charges and credits, Noncontrolling Interests								8
Charges and credits, Net								$ 102
Interest And Other
Charges And Credits [Line Items]
Charges and credits, Pretax Charge (Credit)									$ (347)	$ (65)
Charges and credits, Tax Benefit (Expense)									(44)	(15)
Charges and credits, Net									$ (303)	$ (50)
Interest And Other | Gain On Sale Of Liberty Shares
Charges And Credits [Line Items]
Charges and credits, Pretax Charge (Credit)		$ (36)	$ (84)	$ (215)	$ (26)	$ (28)
Charges and credits, Tax Benefit (Expense)		(8)	(19)	(14)	(4)	(4)
Charges and credits, Net		$ (28)	(65)	(201)	$ (22)	(24)
Interest And Other | Merger And Integration
Charges And Credits [Line Items]
Charges and credits, Pretax Charge (Credit)	$ 56
Charges and credits, Tax Benefit (Expense)	8
Charges and credits, Noncontrolling Interests	8
Charges and credits, Net	40
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 | Early Repayment of Bonds
Charges And Credits [Line Items]
Charges and credits, Pretax Charge (Credit)						10
Charges and credits, Net						$ 10
Interest And Other | Unrealized Gain On Available For Sale Marketable Securities
Charges And Credits [Line Items]
Charges and credits, Pretax Charge (Credit)							$ (47)
Charges and credits, Tax Benefit (Expense)							(11)
Charges and credits, Net							$ (36)