Information about Variable Annuity Products with Death and Living Benefit Guarantees (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Guaranteed minimum standard death benefit
Net Amount at Risk by Product and Guarantee [Line Items]
Death benefits account value	$ 3,164	$ 3,059
Net amount at risk	6	17
Average attained age of contractholders	72 years	71 years
Guaranteed minimum enhanced death benefit
Net Amount at Risk by Product and Guarantee [Line Items]
Death benefits account value	3,853	3,906
Net amount at risk	114	217
Average attained age of contractholders	72 years	71 years
Guaranteed minimum living benefit
Net Amount at Risk by Product and Guarantee [Line Items]
Living benefit guarantees	4,054	4,020
Guaranteed annuitization benefits
Net Amount at Risk by Product and Guarantee [Line Items]
Living benefit guarantees	$ 1,508	$ 1,470