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Net Investment Gains (Losses) (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Investments [Abstract]      
Realized gains $ 169 $ 229 $ 249
Realized losses (144) (66) (121)
Net realized gains (losses) on available-for-sale securities 25 163 128
Total other-than-temporary impairments 0 (6) (40)
Portion of other-than-temporary impairments included in other comprehensive income (loss) 0 0 0
Net other-than-temporary impairments 0 (6) (40)
Net realized gains (losses) on equity securities sold 11 0 0
Net unrealized gains (losses) on equity securities still held (98) 0 0
Trading securities 0 1 10
Limited partnerships 11 0 6
Commercial mortgage loans 0 3 1
Net gains (losses) related to securitization entities 0 7 [1] (50) [1]
Derivative instruments [2] (95) 97 20
Contingent consideration adjustment 0 0 (2)
Other 0 0 (1)
Net investment gains (losses) $ (146) $ 265 $ 72
[1] See note 17 for additional information related to consolidated securitization entities.
[2] See note 5 for additional information on the impact of derivative instruments included in net investment gains (losses).