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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 |

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