FAIR VALUES OF FINANCIAL INSTRUMENTS - Fair Value Level Disclosure (Details) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Assets disclosed at fair value
Total assets measured at fair value	$ 18,156	$ 17,989
Level 3
Assets disclosed at fair value
Total assets measured at fair value	18,156	17,989
Recurring
Assets disclosed at fair value
Investment securities	224	239
Total assets measured at fair value	224	239
Recurring | Level 1
Assets disclosed at fair value
Investment securities	45	48
Total assets measured at fair value	45	48
Recurring | Level 2
Assets disclosed at fair value
Investment securities	179	191
Total assets measured at fair value	$ 179	$ 191