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Charges and Credits - Summary of Charges and Credits (Detail) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Mar. 31, 2022
Jun. 30, 2022
Charges And Credits [Line Items]      
Charges and credits, Pretax $ (285,000,000)    
Charges and credits, Tax (19,000,000)    
Charges and credits, Tax (266,000,000)   $ 0
Interest And Other | Gain On Sale Of Liberty Shares      
Charges And Credits [Line Items]      
Charges and credits, Pretax (216,000,000) $ (26,000,000)  
Charges and credits, Tax (13,000,000) (4,000,000)  
Charges and credits, Tax (203,000,000) $ (22,000,000)  
Interest And Other | Gain On Sale Of Real Estate      
Charges And Credits [Line Items]      
Charges and credits, Pretax (43,000,000)    
Charges and credits, Tax (2,000,000)    
Charges and credits, Tax $ (41,000,000)