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Fair Value Measurements (Narrative) (Detail)
6 Months Ended
Jun. 30, 2012
Day
Fair Value Measurements Of Financial Instruments [Line Items]  
Minimum number of pricing services used to obtain fair value measurements for the majority of the investment securities held 1
The maximum maturity period in years to be classified as a short-term investment 1
GLB - Lapse rate - lower range 1.00%
GLB - Lapse rate - upper range 6.00%
GLB - Spike lapse rate - lower range 10.00%
GLB - Spike lapse rate - upper range 30.00%
GLB - Ultimate lapse rate 10.00%
GLB - Length of ultimate lapse rate period, years 2
GLB - Adjustment factor for valuable guarantees - lower 15.00%
GLB - Adjustment factor for valuable guarantees - upper 75.00%
Percent of GMIB guaranteed value that are represented by clients with several years of annuitization experience 36.00%
GLB - Maximum annuitization rate 8.00%
GLB - First year maximum annuitization rate 13.00%
GLB - Number of different annuitization functions used 3
GLB - Weighted average maximum annuitization rate - rate 1 8.00%
GLB - Weighted average maximum annuitization rate - rate 2 12.00%
GLB - Weighted average maximum annuitization rate - rate 3 30.00%
Redemption Notice Periods Lower Range [Member]
 
Fair Value Measurements Of Financial Instruments [Line Items]  
Notice period for redemption for alternative investments investment funds, days 5
Redemption Notice Periods Upper Range [Member]
 
Fair Value Measurements Of Financial Instruments [Line Items]  
Notice period for redemption for alternative investments investment funds, days 120