INVESTMENT SECURITIES - Schedule of Contractual Maturities of Debt Securities Available for Sale (Detail) - USD ($) $ in Millions |
Sep. 30, 2016 |
Dec. 31, 2015 |
|---|---|---|
| Amortized Cost | ||
| Due within one year | $ 611 | |
| Due after one year through five years | 2,152 | |
| Due after five years through ten years | 1,647 | |
| Due after ten years | 2,629 | |
| Mortgage and asset-backed securities | 2,207 | |
| Amortized Cost | 9,246 | $ 9,018 |
| Fair Value | ||
| Due within one year | 610 | |
| Due after one year through five years | 2,200 | |
| Due after five years through ten years | 1,698 | |
| Due after ten years | 2,858 | |
| Mortgage and asset-backed securities | 2,236 | |
| Fair Value | $ 9,602 | $ 9,110 |