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SECURITIES - Amortized Cost and Fair Value of Securities, by Contractual Maturities (Detail) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Schedule Of Securities [Line Items]
Available for sale, due in one year or less, amortized cost	$ 123
Available for sale, due after one year but within five years, amortized cost	194
Available for sale, due after five years but within ten years, amortized cost	73
Available for sale, due after ten years, amortized cost	100
Available for sale, with contractual maturities, amortized cost	490
Amortized Cost	3,268	$ 3,401
Available for sale, due in one year or less, fair value	123
Available for sale, due after one year but within five years, fair value	195
Available for sale, due after five years but within ten years, fair value	72
Available for sale, due after ten years, fair value	100
Available for sale, with contractual maturities, fair value	490
Total securities available for sale, fair value	3,279	3,341
Held to maturity, due in one year or less, amortized cost	33
Held to maturity, due after one year but within five years, amortized cost	181
Held to maturity, due after five years but within ten years, amortized cost	97
Held to maturity, due after ten years, amortized cost	988
Held to maturity, with contractual maturities, amortized cost	1,299
Amortized Cost	3,079	3,254
Held to maturity, due in one year or less, fair value	33
Held to maturity, due after one year but within five years, fair value	179
Held to maturity, due after five years but within ten years, fair value	99
Held to maturity, due after ten years, fair value	1,000
Securities held to maturity, with contractual maturities, fair value	1,311
Held-to-maturity, fair value, net	3,093	3,155
Agency Mortgage-Backed Securities [Member]
Schedule Of Securities [Line Items]
Available-for-sale, amortized cost	1,318
Amortized Cost	1,318	1,465
Available for sale, fair value	1,315
Total securities available for sale, fair value	1,315	1,429
Held-to-maturity, amortized cost	952
Amortized Cost	952	1,036
Held-to-maturity, fair value	952
Held-to-maturity, fair value, net	952	1,010
Agency Collateralized Mortgage Obligations [Member]
Schedule Of Securities [Line Items]
Available-for-sale, amortized cost	1,233
Amortized Cost	1,233	1,179
Available for sale, fair value	1,242
Total securities available for sale, fair value	1,242	1,161
Held-to-maturity, amortized cost	728
Amortized Cost	728	794
Held-to-maturity, fair value	726
Held-to-maturity, fair value, net	726	771
Commercial Mortgage-Backed Securities [Member]
Schedule Of Securities [Line Items]
Available-for-sale, amortized cost	227
Amortized Cost	227	229
Available for sale, fair value	232
Total securities available for sale, fair value	232	228
Held-to-maturity, amortized cost	100
Amortized Cost	100	126
Held-to-maturity, fair value	104
Held-to-maturity, fair value, net	$ 104	$ 126

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