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Equity Securities - (Summary of Investments in Marketable Equity Securities) (Detail) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
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Schedule Of Trading Securities And Other Trading Assets [Line Items] |  |
Equity securities, Cost | $ 339 | $ 435
Equity securities, Unrealized gains (losses) | (59) | 222
Equity securities, Estimated fair value | 280 | 657
Common Stock |  |
Schedule Of Trading Securities And Other Trading Assets [Line Items] |  |
Equity securities, Cost | 324 | 418
Equity securities, Unrealized gains (losses) | (55) | 222
Equity securities, Estimated fair value | 269 | 640
Preferred Stock |  |
Schedule Of Trading Securities And Other Trading Assets [Line Items] |  |
Equity securities, Cost | 15 | 17
Equity securities, Unrealized gains (losses) | (4) | 0
Equity securities, Estimated fair value | $ 11 | $ 17

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