FAIR VALUE MEASUREMENTS - Schedule of Fair Value Measurements (Details) - USD ($) $ in Millions		Dec. 31, 2022	Dec. 31, 2021
Assets
Debt securities, available for sale, at fair value pledged to creditors	[1]	$ 24,007	$ 26,067
Loans held for sale, at fair value:		774	2,733
Mortgage servicing rights		1,530	1,029
Total derivative assets		1,839	1,509
Equity securities, at fair value		110	102
Total assets		28,260	31,440
Liabilities
Total derivative liabilities		3,111	922
Total liabilities		3,111	922
Equity securities, at fair value, Fair Value		153	109
Interest rate contracts
Assets
Total derivative assets		347	692
Liabilities
Total derivative liabilities		1,632	176
Foreign exchange contracts
Assets
Total derivative assets		527	263
Liabilities
Total derivative liabilities		519	231
Commodities contracts
Assets
Total derivative assets		953	508
Liabilities
Total derivative liabilities		942	505
TBA contracts
Assets
Total derivative assets		7	8
Liabilities
Total derivative liabilities		14	8
Other contracts
Assets
Total derivative assets		5	38
Liabilities
Total derivative liabilities		4	2
Level 1
Assets
Debt securities, available for sale, at fair value pledged to creditors		3,486	11
Loans held for sale, at fair value:		0	0
Total derivative assets		0	0
Equity securities, at fair value		110	95
Total assets		3,596	106
Liabilities
Total derivative liabilities		0	0
Total liabilities		0	0
Level 1 | Interest rate contracts
Assets
Total derivative assets		0	0
Liabilities
Total derivative liabilities		0	0
Level 1 | Foreign exchange contracts
Assets
Total derivative assets		0	0
Liabilities
Total derivative liabilities		0	0
Level 1 | Commodities contracts
Assets
Total derivative assets		0	0
Liabilities
Total derivative liabilities		0	0
Level 1 | TBA contracts
Assets
Total derivative assets		0	0
Liabilities
Total derivative liabilities		0	0
Level 1 | Other contracts
Assets
Total derivative assets		0	0
Liabilities
Total derivative liabilities		0	0
Level 2
Assets
Debt securities, available for sale, at fair value pledged to creditors		20,521	26,056
Loans held for sale, at fair value:		774	2,733
Total derivative assets		1,834	1,471
Equity securities, at fair value		0	7
Total assets		23,129	30,267
Liabilities
Total derivative liabilities		3,107	922
Total liabilities		3,107	922
Level 2 | Interest rate contracts
Assets
Total derivative assets		347	692
Liabilities
Total derivative liabilities		1,632	176
Level 2 | Foreign exchange contracts
Assets
Total derivative assets		527	263
Liabilities
Total derivative liabilities		519	231
Level 2 | Commodities contracts
Assets
Total derivative assets		953	508
Liabilities
Total derivative liabilities		942	505
Level 2 | TBA contracts
Assets
Total derivative assets		7	8
Liabilities
Total derivative liabilities		14	8
Level 2 | Other contracts
Assets
Total derivative assets		0	0
Liabilities
Total derivative liabilities		0	2
Level 3
Assets
Debt securities, available for sale, at fair value pledged to creditors		0	0
Loans held for sale, at fair value:		0	0
Total derivative assets		5	38
Equity securities, at fair value		0	0
Total assets		1,535	1,067
Liabilities
Total derivative liabilities		4	0
Total liabilities		4	0
Level 3 | Interest rate contracts
Assets
Total derivative assets		0	0
Liabilities
Total derivative liabilities		0	0
Level 3 | Foreign exchange contracts
Assets
Total derivative assets		0	0
Liabilities
Total derivative liabilities		0	0
Level 3 | Commodities contracts
Assets
Total derivative assets		0	0
Liabilities
Total derivative liabilities		0	0
Level 3 | TBA contracts
Assets
Total derivative assets		0	0
Liabilities
Total derivative liabilities		0	0
Level 3 | Other contracts
Assets
Total derivative assets		5	38
Liabilities
Total derivative liabilities		4	0
Investments Measured at Net Asset Value
Liabilities
Equity securities, at fair value, Fair Value		43	7
Unfunded capital commitments		42
Total mortgage-backed securities
Assets
Debt securities, available for sale, at fair value pledged to creditors		19,313	24,847
Total mortgage-backed securities | Level 1
Assets
Debt securities, available for sale, at fair value pledged to creditors		0	0
Total mortgage-backed securities | Level 2
Assets
Debt securities, available for sale, at fair value pledged to creditors		19,313	24,847
Total mortgage-backed securities | Level 3
Assets
Debt securities, available for sale, at fair value pledged to creditors		0	0
Collateralized loan obligations
Assets
Debt securities, available for sale, at fair value pledged to creditors		1,206	1,207
Collateralized loan obligations | Level 1
Assets
Debt securities, available for sale, at fair value pledged to creditors		0	0
Collateralized loan obligations | Level 2
Assets
Debt securities, available for sale, at fair value pledged to creditors		1,206	1,207
Collateralized loan obligations | Level 3
Assets
Debt securities, available for sale, at fair value pledged to creditors		0	0
State and political subdivisions
Assets
Debt securities, available for sale, at fair value pledged to creditors		2	2
State and political subdivisions | Level 1
Assets
Debt securities, available for sale, at fair value pledged to creditors		0	0
State and political subdivisions | Level 2
Assets
Debt securities, available for sale, at fair value pledged to creditors		2	2
State and political subdivisions | Level 3
Assets
Debt securities, available for sale, at fair value pledged to creditors		0	0
U.S. Treasury and other
Assets
Debt securities, available for sale, at fair value pledged to creditors		3,486	11
U.S. Treasury and other | Level 1
Assets
Debt securities, available for sale, at fair value pledged to creditors		3,486	11
U.S. Treasury and other | Level 2
Assets
Debt securities, available for sale, at fair value pledged to creditors		0	0
U.S. Treasury and other | Level 3
Assets
Debt securities, available for sale, at fair value pledged to creditors		0	0
Residential loans held for sale
Assets
Loans held for sale, at fair value:		666	2,657
Residential loans held for sale | Level 1
Assets
Loans held for sale, at fair value:		0	0
Residential loans held for sale | Level 2
Assets
Loans held for sale, at fair value:		666	2,657
Residential loans held for sale | Level 3
Assets
Loans held for sale, at fair value:		0	0
Commercial loans held for sale
Assets
Loans held for sale, at fair value:		108	76
Commercial loans held for sale | Level 1
Assets
Loans held for sale, at fair value:		0	0
Commercial loans held for sale | Level 2
Assets
Loans held for sale, at fair value:		108	76
Commercial loans held for sale | Level 3
Assets
Loans held for sale, at fair value:		0	0
Mortgage Servicing Rights
Assets
Mortgage servicing rights		1,530	1,029
Mortgage Servicing Rights | Level 1
Assets
Mortgage servicing rights		0	0
Mortgage Servicing Rights | Level 2
Assets
Mortgage servicing rights		0	0
Mortgage Servicing Rights | Level 3
Assets
Mortgage servicing rights		$ 1,530	$ 1,029

[1] Includes only collateral pledged by the Company where counterparties have the right to sell or pledge the collateral.