INVESTMENT SECURITIES - Contractual Maturities, Available for Sale (Detail) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016
Amortized Cost
Due within one year	$ 538
Due after one year through five years	2,666
Due after five years through ten years	2,237
Due after ten years	3,101
Mortgage and asset-backed securities	2,104
Amortized Cost	10,646	$ 9,826
Fair Value
Due within one year	539
Due after one year through five years	2,680
Due after five years through ten years	2,235
Due after ten years	3,248
Mortgage and asset-backed securities	2,083
Fair Value	$ 10,785	$ 9,798