Schedule of Pre-Tax Gain (Loss) Recognized in Net Income for Effects of Derivatives not Designated as Hedges (Detail) (Derivatives not designated as hedges, USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Derivative [Line Items]
Pre-tax gain (loss) recognized in net income (loss)	$ (2)	$ 28	$ (23)	$ (1)
Interest rate swaps | Net Investment Gains (Losses)
Derivative [Line Items]
Pre-tax gain (loss) recognized in net income (loss)	(2)	(6)	(5)	(5)
Interest rate swaps related to securitization entities | Net Investment Gains (Losses)
Derivative [Line Items]
Pre-tax gain (loss) recognized in net income (loss)	(3)	7	(6)	9
Credit default swaps | Net Investment Gains (Losses)
Derivative [Line Items]
Pre-tax gain (loss) recognized in net income (loss)	0	2	0	6
Credit default swaps related to securitization entities | Net Investment Gains (Losses)
Derivative [Line Items]
Pre-tax gain (loss) recognized in net income (loss)	11	17	18	25
Equity index options | Net Investment Gains (Losses)
Derivative [Line Items]
Pre-tax gain (loss) recognized in net income (loss)	(11)	(2)	(18)	(18)
Financial futures | Net Investment Gains (Losses)
Derivative [Line Items]
Pre-tax gain (loss) recognized in net income (loss)	17	(56)	44	(153)
Equity return swaps | Net Investment Gains (Losses)
Derivative [Line Items]
Pre-tax gain (loss) recognized in net income (loss)	(4)	1	(5)	(9)
Other foreign currency contracts | Net Investment Gains (Losses)
Derivative [Line Items]
Pre-tax gain (loss) recognized in net income (loss)	(2)	3	(11)	3
Foreign currency swaps | Net Investment Gains (Losses)
Derivative [Line Items]
Pre-tax gain (loss) recognized in net income (loss)	1	0	1	0
GMWB embedded derivatives | Net Investment Gains (Losses)
Derivative [Line Items]
Pre-tax gain (loss) recognized in net income (loss)	2	63	(29)	145
Fixed index annuity embedded derivatives | Net Investment Gains (Losses)
Derivative [Line Items]
Pre-tax gain (loss) recognized in net income (loss)	$ (11)	$ (1)	$ (12)	$ (4)