INVESTMENT SECURITIES - Contractual Maturities (Details) $ in Millions	Jun. 30, 2023 USD ($)
Amortized cost
Within one year	$ 931
After one year through five years	4,761
After five years through ten years	5,415
After ten years	23,392
Estimated fair value
Within one year	924
After one year through five years	4,710
After five years through ten years	5,384
After ten years	$ 21,697