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Investments (Net Realized Gains (Losses) From Sales Of Available-For-Sale Securities) (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Investments [Abstract] |  |  |  |
Proceeds from sales | $ 508 | $ 583 | $ 1,875 | $ 1,647
Available For Sale Securities Realized Gain Loss [Abstract] |  |  |  |
Gross realized gains | 79 | 1 | 100 | 4
Gross realized losses | $ 0 | $ (2) | $ (3) | $ (15)

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