Schedule of Pre-Tax Gain (Loss) Recognized in Net Income (Loss) for Effects of Derivatives not Designated as Hedges (Detail) - Derivatives not designated as hedges - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Derivative [Line Items]
Pre-tax gain (loss) recognized in net loss	$ 18	$ (33)	$ (81)	$ (79)
Interest rate swaps | Net Investment Gains (Losses)
Derivative [Line Items]
Pre-tax gain (loss) recognized in net loss	1	(2)	(11)	(6)
Equity index options | Net Investment Gains (Losses)
Derivative [Line Items]
Pre-tax gain (loss) recognized in net loss	7	1	(2)	28
Financial futures | Net Investment Gains (Losses)
Derivative [Line Items]
Pre-tax gain (loss) recognized in net loss	(41)	35	97	8
Other foreign currency contracts | Net Investment Gains (Losses)
Derivative [Line Items]
Pre-tax gain (loss) recognized in net loss	12	(10)	9	(17)
GMWB embedded derivatives | Net Investment Gains (Losses)
Derivative [Line Items]
Pre-tax gain (loss) recognized in net loss	54	(44)	(153)	(21)
Fixed index annuity embedded derivatives | Net Investment Gains (Losses)
Derivative [Line Items]
Pre-tax gain (loss) recognized in net loss	(18)	(14)	(31)	(72)
Indexed universal life embedded derivatives | Net Investment Gains (Losses)
Derivative [Line Items]
Pre-tax gain (loss) recognized in net loss	$ 3	$ 1	$ 10	$ 1