FAIR VALUE MEASUREMENT - Items Measured at Fair Value on a Nonrecurring Basis (Details) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Items Measured at Fair Value on a Nonrecurring Basis
Non-marketable equity securities measured using the measurement alternative	$ 8,009	$ 7,337
Nonrecurring | Level 2
Items Measured at Fair Value on a Nonrecurring Basis
Loans held-for-sale	1,151	986
Other real estate owned	0	0
Loans	0	0
Non-marketable equity securities measured using the measurement alternative	0	104
Total assets	1,151	1,090
Nonrecurring | Level 3
Items Measured at Fair Value on a Nonrecurring Basis
Loans held-for-sale	2,024	1,312
Other real estate owned	3	11
Loans	126	144
Non-marketable equity securities measured using the measurement alternative	70	551
Total assets	2,223	2,018
Fair value | Nonrecurring
Items Measured at Fair Value on a Nonrecurring Basis
Loans held-for-sale	3,175	2,298
Other real estate owned	3	11
Loans	126	144
Non-marketable equity securities measured using the measurement alternative	70	655
Total assets	$ 3,374	$ 3,108