INVESTMENT SECURITIES - Contractual Maturities, Available for Sale (Detail) - USD ($) $ in Millions	Mar. 31, 2017	Dec. 31, 2016
Amortized Cost
Due within one year	$ 561
Due after one year through five years	2,764
Due after five years through ten years	2,188
Due after ten years	2,926
Mortgage and asset-backed securities	2,197
Amortized Cost	10,636	$ 9,826
Fair Value
Due within one year	562
Due after one year through five years	2,770
Due after five years through ten years	2,153
Due after ten years	2,977
Mortgage and asset-backed securities	2,167
Fair Value	$ 10,629	$ 9,798