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Equity Securities - (Summary of Investments in Marketable Equity Securities) (Detail) - USD ($) $ in Millions | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Schedule Of Trading Securities And Other Trading Assets [Line Items] |  |
Equity securities, Cost | $ 390 | $ 435
Equity securities, Unrealized gains (losses) | 2 | 222
Equity securities, Estimated fair value | 392 | 657
Preferred Stock |  |
Schedule Of Trading Securities And Other Trading Assets [Line Items] |  |
Equity securities, Cost | 16 | 17
Equity securities, Unrealized gains (losses) | (2) | 0
Equity securities, Estimated fair value | 14 | 17
Common Stock |  |
Schedule Of Trading Securities And Other Trading Assets [Line Items] |  |
Equity securities, Cost | 374 | 418
Equity securities, Unrealized gains (losses) | 4 | 222
Equity securities, Estimated fair value | $ 378 | $ 640

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