INVESTMENT SECURITIES - Schedule of Realized Gains (Losses) Related to Investment Securities Included Within Investment Income (Detail) - USD ($) $ in Millions |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Sep. 30, 2016 |
Sep. 30, 2015 |
Sep. 30, 2016 |
Sep. 30, 2015 |
|
| Investments, Debt and Equity Securities [Abstract] | ||||
| Gross realized gains | $ 37 | $ 62 | $ 88 | $ 108 |
| Gross realized losses | (11) | (11) | (23) | (20) |
| Net realized capital gains | $ 26 | $ 51 | $ 65 | $ 88 |