Charges and Credits - Summary of Charges and Credits (Detail) - USD ($)	3 Months Ended			6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Mar. 31, 2022	Jun. 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)