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Assumed Life Reinsurance Programs Involving Minimum Benefit Guarantees Under Annuity Contracts (Schedule Of Guaranteed Minimum Benefits Income And Expense) (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Guaranteed Minimum Benefits [Line Items]        
Net premiums earned $ 4,360 $ 4,332 $ 8,287 $ 8,302
Policy benefits and other reserve adjustments 153 144 295 258
Net realized gains (losses) 126 (73) 37 (177)
Guaranteed Minimum Death Benefit [Member]        
Guaranteed Minimum Benefits [Line Items]        
Net premiums earned 16 18 32 37
Policy benefits and other reserve adjustments 11 13 20 28
Guaranteed Living Benefit [Member]        
Guaranteed Minimum Benefits [Line Items]        
Net premiums earned 30 34 62 70
Policy benefits and other reserve adjustments 7 10 19 19
Net realized gains (losses) 104 2 59 (48)
Gain recognized in Net income 127 26 102 3
Less: Net cash received 26 29 54 62
Net (increase) decrease in liability $ 101 $ (3) $ 48 $ (59)