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Equity Securities (Narrative) (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Schedule Of Investments [Line Items]        
Net (losses) gains on equity securities $ (141) $ 24 $ (206) $ 43
Net unrealized gains and (losses) on equity securities (133) 24 (198) 42
Cash proceeds from sale of equity securities     157 73
Non Marketable Equity Securities        
Schedule Of Investments [Line Items]        
Net unrealized gains and (losses) on equity securities 15 $ 44 4 $ 86
Realized gain on securities     51  
Non Marketable Equity Securities | Offerpad Inc [Member]        
Schedule Of Investments [Line Items]        
Net unrealized losses on equity securities $ 92   136  
Investment In Insurance Business        
Schedule Of Investments [Line Items]        
Cash proceeds from sale of equity securities     $ 63