INVESTMENT SECURITIES - Schedule of Contractual Maturities of Debt Securities Available for Sale (Detail) - USD ($) $ in Millions	Jun. 30, 2016	Dec. 31, 2015
Amortized Cost
Due within one year	$ 396
Due after one year through five years	2,119
Due after five years through ten years	1,451
Due after ten years	2,447
Mortgage and asset-backed securities	2,676
Amortized Cost	9,089	$ 9,018
Fair Value
Due within one year	395
Due after one year through five years	2,176
Due after five years through ten years	1,513
Due after ten years	2,692
Mortgage and asset-backed securities	2,692
Fair Value	$ 9,468	$ 9,110