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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

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