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FAIR VALUE MEASUREMENTS - Schedule of Fair Value Measurements (Details) - USD ($) $ in Millions		Dec. 31, 2020	Dec. 31, 2019
Assets
Debt securities available for sale:	[1]	$ 22,942	$ 20,613
Loans held for sale, at fair value:		3,564	1,946
Mortgage servicing rights		658	642
Total derivative assets		2,153	984
Equity securities, at fair value		66	47
Total assets		29,383	24,232
Liabilities
Total derivative liabilities		634	322
Total liabilities		634	322
Interest rate contracts
Assets
Total derivative assets		1,566	773
Liabilities
Total derivative liabilities		217	133
Foreign exchange contracts
Assets
Total derivative assets		320	174
Liabilities
Total derivative liabilities		291	166
TBA contracts
Assets
Total derivative assets		8
Liabilities
Total derivative liabilities		65
Other contracts
Assets
Total derivative assets		259	37
Liabilities
Total derivative liabilities		61	23
Level 1
Assets
Debt securities available for sale:		11	71
Loans held for sale, at fair value:		0	0
Total derivative assets		0	0
Equity securities, at fair value		66	47
Total assets		77	118
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 | TBA contracts
Assets
Total derivative assets		0
Liabilities
Total derivative liabilities		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:		22,931	20,542
Loans held for sale, at fair value:		3,564	1,946
Total derivative assets		1,956	965
Equity securities, at fair value		0	0
Total assets		28,451	23,453
Liabilities
Total derivative liabilities		634	322
Total liabilities		634	322
Level 2 | Interest rate contracts
Assets
Total derivative assets		1,566	773
Liabilities
Total derivative liabilities		217	133
Level 2 | Foreign exchange contracts
Assets
Total derivative assets		320	174
Liabilities
Total derivative liabilities		291	166
Level 2 | TBA contracts
Assets
Total derivative assets		8
Liabilities
Total derivative liabilities		65
Level 2 | Other contracts
Assets
Total derivative assets		62	18
Liabilities
Total derivative liabilities		61	23
Level 3
Assets
Debt securities available for sale:		0	0
Loans held for sale, at fair value:		0	0
Total derivative assets		197	19
Equity securities, at fair value		0	0
Total assets		855	661
Liabilities
Total derivative liabilities		0	0
Total liabilities		0	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 | TBA contracts
Assets
Total derivative assets		0
Liabilities
Total derivative liabilities		0
Level 3 | Other contracts
Assets
Total derivative assets		197	19
Liabilities
Total derivative liabilities		0	0
Mortgage-backed securities
Assets
Debt securities available for sale:		22,928	20,537
Mortgage-backed securities | Level 1
Assets
Debt securities available for sale:		0	0
Mortgage-backed securities | Level 2
Assets
Debt securities available for sale:		22,928	20,537
Mortgage-backed securities | Level 3
Assets
Debt securities available for sale:		0	0
State and political subdivisions
Assets
Debt securities available for sale:		3	5
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:		3	5
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:		11	71
U.S. Treasury and other | Level 1
Assets
Debt securities available for sale:		11	71
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:		3,416	1,778
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:		3,416	1,778
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:		148	168
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:		148	168
Commercial loans held for sale | Level 3
Assets
Loans held for sale, at fair value:		0	0
MSRs
Assets
Mortgage servicing rights		658	642
MSRs | Level 1
Assets
Mortgage servicing rights		0	0
MSRs | Level 2
Assets
Mortgage servicing rights		0	0
MSRs | Level 3
Assets
Mortgage servicing rights		$ 658	$ 642
[1] Includes only collateral pledged by the Company where counterparties have the right to sell or pledge the collateral.

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