FAIR VALUE MEASUREMENTS - Schedule of Fair Value Measurements (Details) - USD ($) $ in Millions		Dec. 31, 2023	Dec. 31, 2022
Assets
Fair Value	[1]	$ 29,777	$ 24,007
Loans held for sale, at fair value:		676	774
Mortgage servicing rights		1,552	1,530
Total derivative assets		1,593	1,839
Equity securities, at fair value		115	110
Total assets		33,713	28,260
Liabilities
Total derivative liabilities		2,183	3,111
Total liabilities		2,183	3,111
Equity securities, at fair value		173	153
Interest rate contracts
Assets
Total derivative assets		464	347
Liabilities
Total derivative liabilities		1,149	1,632
Foreign exchange contracts
Assets
Total derivative assets		434	527
Liabilities
Total derivative liabilities		378	519
Commodities contracts
Assets
Total derivative assets		685	953
Liabilities
Total derivative liabilities		640	942
TBA contracts
Assets
Total derivative assets		3	7
Liabilities
Total derivative liabilities		16	14
Other contracts
Assets
Total derivative assets		7	5
Liabilities
Total derivative liabilities		0	4
Level 1
Assets
Fair Value		4,380	3,486
Loans held for sale, at fair value:		0	0
Total derivative assets		0	0
Equity securities, at fair value		115	110
Total assets		4,495	3,596
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
Fair Value		25,397	20,521
Loans held for sale, at fair value:		676	774
Total derivative assets		1,586	1,834
Equity securities, at fair value		0	0
Total assets		27,659	23,129
Liabilities
Total derivative liabilities		2,183	3,107
Total liabilities		2,183	3,107
Level 2 | Interest rate contracts
Assets
Total derivative assets		464	347
Liabilities
Total derivative liabilities		1,149	1,632
Level 2 | Foreign exchange contracts
Assets
Total derivative assets		434	527
Liabilities
Total derivative liabilities		378	519
Level 2 | Commodities contracts
Assets
Total derivative assets		685	953
Liabilities
Total derivative liabilities		640	942
Level 2 | TBA contracts
Assets
Total derivative assets		3	7
Liabilities
Total derivative liabilities		16	14
Level 2 | Other contracts
Assets
Total derivative assets		0	0
Liabilities
Total derivative liabilities		0	0
Level 3
Assets
Fair Value		0	0
Loans held for sale, at fair value:		0	0
Total derivative assets		7	5
Equity securities, at fair value		0	0
Total assets		1,559	1,535
Liabilities
Total derivative liabilities		0	4
Total liabilities		0	4
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		7	5
Liabilities
Total derivative liabilities		0	4
Investments Measured at Net Asset Value
Liabilities
Equity securities, at fair value		58	43
Unfunded capital commitments		28	42
Total mortgage-backed securities
Assets
Fair Value		24,732	19,313
Total mortgage-backed securities | Level 1
Assets
Fair Value		0	0
Total mortgage-backed securities | Level 2
Assets
Fair Value		24,732	19,313
Total mortgage-backed securities | Level 3
Assets
Fair Value		0	0
Collateralized loan obligations
Assets
Fair Value		664	1,206
Collateralized loan obligations | Level 1
Assets
Fair Value		0	0
Collateralized loan obligations | Level 2
Assets
Fair Value		664	1,206
Collateralized loan obligations | Level 3
Assets
Fair Value		0	0
State and political subdivisions
Assets
Fair Value		1	2
State and political subdivisions | Level 1
Assets
Fair Value		0	0
State and political subdivisions | Level 2
Assets
Fair Value		1	2
State and political subdivisions | Level 3
Assets
Fair Value		0	0
U.S. Treasury and other
Assets
Fair Value		4,380	3,486
U.S. Treasury and other | Level 1
Assets
Fair Value		4,380	3,486
U.S. Treasury and other | Level 2
Assets
Fair Value		0	0
U.S. Treasury and other | Level 3
Assets
Fair Value		0	0
Residential loans held for sale
Assets
Loans held for sale, at fair value:		614	666
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:		614	666
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:		62	108
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:		62	108
Commercial loans held for sale | Level 3
Assets
Loans held for sale, at fair value:		0	0
Mortgage Servicing Rights
Assets
Mortgage servicing rights		1,552	1,530
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		$ 1,552	$ 1,530

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