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Investments - Net Investment Income and Investment Gains (Losses) (Parenthetical) (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Net Investment Income [Line Items] |  |  |  |
Net unrealized gains (losses) on trading securities | $ 8 | $ (4) | $ 48 | $ (25)
Fixed Maturity Securities [Member] |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Gross realized gains on available-for-sale securities | 28 | 37 | 64 | 106
Gross realized losses on available-for-sale securities | 31 | 33 | 73 | 84
Fixed Maturity Securities [Member] | Nonredeemable Preferred Stock [Member] |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Net realized gains (losses) on trading securities | $ 11 | $ 10 | $ 53 | $ 25

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