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Equity Securities (Narrative) (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Schedule Of Investments [Line Items] |  |  |
Realized and unrealized net gains on equity securities | $ (263) | $ 184 |
Net unrealized gains on equity securities | (237) | 172 |
Non-Marketable Equity Securities | 396 | 441 |
Cash proceeds from sale of equity securities | 241 | 172 | $ 103
Offerpad Inc [Member] |  |  |
Schedule Of Investments [Line Items] |  |  |
Net unrealized losses on equity securities | 191 |  |
Net unrealized gains on equity securities |  | 121 |
Non Marketable Equity Securities |  |  |
Schedule Of Investments [Line Items] |  |  |
Cost | 307 | 215 |
Non-Marketable Equity Securities | 396 | 441 |
Net unrealized losses on equity securities | 153 |  |
Net unrealized gains on equity securities | 16 | $ 210 |
Recognized impairment charges of investments | 140 |  |
Realized gain on securities | 52 |  |
Cash proceeds from sale of equity securities | $ 63 |  |

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