FAIR VALUE MEASUREMENTS - Schedule of Fair Value Measurements (Details) - USD ($) $ in Millions		Dec. 31, 2024	Dec. 31, 2023
Assets
Debt securities available for sale	[1]	$ 32,765	$ 29,777
Loans held for sale at fair value		825	676
Mortgage servicing rights		1,491	1,552
Total derivative assets		1,476	1,593
Equity securities, at fair value		162	115
Short-term investments		53
Total assets		36,772	33,713
Liabilities
Total derivative liabilities		1,710	2,183
Short-term borrowed funds		0	505
Other liabilities		101
Total liabilities		1,811	2,183
Equity securities, at fair value		220	173
Interest rate contracts
Assets
Total derivative assets		562	464
Liabilities
Total derivative liabilities		910	1,149
Foreign exchange contracts
Assets
Total derivative assets		472	434
Liabilities
Total derivative liabilities		411	378
Commodities contracts
Assets
Total derivative assets		429	685
Liabilities
Total derivative liabilities		379	640
TBA contracts
Assets
Total derivative assets		10	3
Liabilities
Total derivative liabilities		8	16
Other contracts
Assets
Total derivative assets		3	7
Liabilities
Total derivative liabilities		2	0
Level 1
Assets
Debt securities available for sale		3,525	4,380
Loans held for sale at fair value		0	0
Total derivative assets		0	0
Equity securities, at fair value		162	115
Short-term investments		40
Total assets		3,727	4,495
Liabilities
Total derivative liabilities		0	0
Short-term borrowed funds		0	0
Other liabilities		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		29,240	25,397
Loans held for sale at fair value		825	676
Total derivative assets		1,473	1,586
Equity securities, at fair value		0	0
Short-term investments		13
Total assets		31,551	27,659
Liabilities
Total derivative liabilities		1,708	2,183
Short-term borrowed funds		0	505
Other liabilities		101
Total liabilities		1,809	2,183
Level 2 | Interest rate contracts
Assets
Total derivative assets		562	464
Liabilities
Total derivative liabilities		910	1,149
Level 2 | Foreign exchange contracts
Assets
Total derivative assets		472	434
Liabilities
Total derivative liabilities		411	378
Level 2 | Commodities contracts
Assets
Total derivative assets		429	685
Liabilities
Total derivative liabilities		379	640
Level 2 | TBA contracts
Assets
Total derivative assets		10	3
Liabilities
Total derivative liabilities		8	16
Level 2 | Other contracts
Assets
Total derivative assets		0	0
Liabilities
Total derivative liabilities		0	0
Level 3
Assets
Debt securities available for sale		0	0
Loans held for sale at fair value		0	0
Total derivative assets		3	7
Equity securities, at fair value		0	0
Short-term investments		0
Total assets		1,494	1,559
Liabilities
Total derivative liabilities		2	0
Short-term borrowed funds		0	0
Other liabilities		0
Total liabilities		2	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		3	7
Liabilities
Total derivative liabilities		2	0
Investments Measured at Net Asset Value
Liabilities
Equity securities, at fair value		58	58
Unfunded capital commitments		24	28
Total mortgage-backed securities
Assets
Debt securities available for sale		29,055	24,732
Total mortgage-backed securities | Level 1
Assets
Debt securities available for sale		0	0
Total mortgage-backed securities | Level 2
Assets
Debt securities available for sale		29,055	24,732
Total mortgage-backed securities | Level 3
Assets
Debt securities available for sale		0	0
Collateralized loan obligations
Assets
Debt securities available for sale		184	664
Collateralized loan obligations | Level 1
Assets
Debt securities available for sale		0	0
Collateralized loan obligations | Level 2
Assets
Debt securities available for sale		184	664
Collateralized loan obligations | Level 3
Assets
Debt securities available for sale		0	0
State and political subdivisions
Assets
Debt securities available for sale		1	1
State and political subdivisions | Level 1
Assets
Debt securities available for sale		0	0
State and political subdivisions | Level 2
Assets
Debt securities available for sale		1	1
State and political subdivisions | Level 3
Assets
Debt securities available for sale		0	0
U.S. Treasury and other
Assets
Debt securities available for sale		3,525	4,380
U.S. Treasury and other | Level 1
Assets
Debt securities available for sale		3,525	4,380
U.S. Treasury and other | Level 2
Assets
Debt securities available for sale		0	0
U.S. Treasury and other | Level 3
Assets
Debt securities available for sale		0	0
Residential loans held for sale
Assets
Loans held for sale at fair value		633	614
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		633	614
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		192	62
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		192	62
Commercial loans held for sale | Level 3
Assets
Loans held for sale at fair value		0	0
Mortgage Servicing Rights
Assets
Mortgage servicing rights		1,491	1,552
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		$ 1,491	$ 1,552

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