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) |