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Equity Securities (Narrative) (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Schedule Of Investments [Line Items]    
Realized and unrealized net gains on equity securities $ 184 $ 49
Net unrealized gains on equity securities 172 49
Non-Marketable Equity Securities 441 217
Non Marketable Equity Securities    
Schedule Of Investments [Line Items]    
Cost 215 201
Non-Marketable Equity Securities 441 217
Net unrealized gains on equity securities 210 13
Non Marketable Equity Securities | Orchard Technologies Inc [Member]    
Schedule Of Investments [Line Items]    
Cost 41  
Non-Marketable Equity Securities 106  
Non Marketable Equity Securities | Side Inc [Member]    
Schedule Of Investments [Line Items]    
Cost 10  
Non-Marketable Equity Securities 74  
Non Marketable Equity Securities | Offerpad Inc [Member]    
Schedule Of Investments [Line Items]    
Net unrealized gains on equity securities 121  
Marketable and Non-marketable Equity Securities [Member]    
Schedule Of Investments [Line Items]    
Unrealized gains recognized $ 382 $ 65