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