Schedule of Pre-Tax Gain (Loss) Recognized in Net Income (Loss) for Effects of Derivatives not Designated as Hedges (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Derivative [Line Items]
Pre-tax gain (loss) recognized in net loss	$ (80)	$ (31)	$ (12)
Interest rate swaps | Net Investment (Gains) Losses
Derivative [Line Items]
Pre-tax gain (loss) recognized in net loss	(3)	3	(1)
Credit default swaps related to securitization entities | Net Investment (Gains) Losses
Derivative [Line Items]
Pre-tax gain (loss) recognized in net loss	0	0	7
Equity index options | Net Investment (Gains) Losses
Derivative [Line Items]
Pre-tax gain (loss) recognized in net loss	43	(34)	57
Financial futures | Net Investment (Gains) Losses
Derivative [Line Items]
Pre-tax gain (loss) recognized in net loss	(64)	26	(43)
Equity return swaps | Net Investment (Gains) Losses
Derivative [Line Items]
Pre-tax gain (loss) recognized in net loss	0	(4)	(22)
Other foreign currency contracts | Net Investment (Gains) Losses
Derivative [Line Items]
Pre-tax gain (loss) recognized in net loss	(8)	4	(12)
GMWB embedded derivatives | Net Investment (Gains) Losses
Derivative [Line Items]
Pre-tax gain (loss) recognized in net loss	38	(54)	78
Fixed index annuity embedded derivatives | Net Investment (Gains) Losses
Derivative [Line Items]
Pre-tax gain (loss) recognized in net loss	(90)	15	(84)
Indexed universal life embedded derivatives | Net Investment (Gains) Losses
Derivative [Line Items]
Pre-tax gain (loss) recognized in net loss	$ 4	$ 13	$ 8