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FAIR VALUE MEASUREMENTS - Schedule of Fair Value Measurements (Details) - USD ($) $ in Millions		Mar. 31, 2021	Dec. 31, 2020
Assets
Securities available for sale	[1]	$ 24,467	$ 22,942
Loans held for sale, at fair value		4,304	3,564
Mortgage servicing rights		893	658
Derivative assets		1,727	2,153
Equity securities, at fair value		73	66
Total assets		31,464	29,383
Liabilities
Total derivative liabilities		551	634
Total liabilities		551	634
Interest rate contracts
Assets
Derivative assets		1,125	1,566
Liabilities
Total derivative liabilities		184	217
Foreign exchange contracts
Assets
Derivative assets		273	320
Liabilities
Total derivative liabilities		213	291
Commodity Contract
Assets
Derivative assets		135	62
Liabilities
Total derivative liabilities		138	61
TBA contracts
Assets
Derivative assets		156	8
Liabilities
Total derivative liabilities		16	65
Other contracts
Assets
Derivative assets		38	197
Level 1
Assets
Securities available for sale		11	11
Loans held for sale, at fair value		0	0
Derivative assets		0	0
Equity securities, at fair value		73	66
Total assets		84	77
Liabilities
Total derivative liabilities		0	0
Total liabilities		0	0
Level 1 | Interest rate contracts
Assets
Derivative assets		0	0
Liabilities
Total derivative liabilities		0	0
Level 1 | Foreign exchange contracts
Assets
Derivative assets		0	0
Liabilities
Total derivative liabilities		0	0
Level 1 | Commodity Contract
Assets
Derivative assets		0	0
Liabilities
Total derivative liabilities		0
Level 1 | TBA contracts
Assets
Derivative assets		0	0
Liabilities
Total derivative liabilities		0	0
Level 1 | Other contracts
Assets
Derivative assets		0	0
Level 2
Assets
Securities available for sale		24,456	22,931
Loans held for sale, at fair value		4,304	3,564
Derivative assets		1,689	1,956
Equity securities, at fair value		0	0
Total assets		30,449	28,451
Liabilities
Total derivative liabilities		551	634
Total liabilities		551	634
Level 2 | Interest rate contracts
Assets
Derivative assets		1,125	1,566
Liabilities
Total derivative liabilities		184	217
Level 2 | Foreign exchange contracts
Assets
Derivative assets		273	320
Liabilities
Total derivative liabilities		213	291
Level 2 | Commodity Contract
Assets
Derivative assets		135	62
Liabilities
Total derivative liabilities		138	61
Level 2 | TBA contracts
Assets
Derivative assets		156	8
Liabilities
Total derivative liabilities		16	65
Level 2 | Other contracts
Assets
Derivative assets		0	0
Level 3
Assets
Securities available for sale		0	0
Loans held for sale, at fair value		0	0
Derivative assets		38	197
Equity securities, at fair value		0	0
Total assets		931	855
Liabilities
Total derivative liabilities		0	0
Total liabilities		0	0
Level 3 | Interest rate contracts
Assets
Derivative assets		0	0
Liabilities
Total derivative liabilities		0	0
Level 3 | Foreign exchange contracts
Assets
Derivative assets		0	0
Liabilities
Total derivative liabilities		0	0
Level 3 | Commodity Contract
Assets
Derivative assets		0	0
Liabilities
Total derivative liabilities		0
Level 3 | TBA contracts
Assets
Derivative assets		0	0
Liabilities
Total derivative liabilities		0	0
Level 3 | Other contracts
Assets
Derivative assets		38	197
Mortgage-backed securities
Assets
Securities available for sale		24,453	22,928
Mortgage-backed securities | Level 1
Assets
Securities available for sale		0	0
Mortgage-backed securities | Level 2
Assets
Securities available for sale		24,453	22,928
Mortgage-backed securities | Level 3
Assets
Securities available for sale		0	0
State and political subdivisions
Assets
Securities available for sale		3	3
State and political subdivisions | Level 1
Assets
Securities available for sale		0	0
State and political subdivisions | Level 2
Assets
Securities available for sale		3	3
State and political subdivisions | Level 3
Assets
Securities available for sale		0	0
U.S. Treasury and other
Assets
Securities available for sale		11	11
U.S. Treasury and other | Level 1
Assets
Securities available for sale		11	11
U.S. Treasury and other | Level 2
Assets
Securities available for sale		0	0
U.S. Treasury and other | Level 3
Assets
Securities available for sale		0	0
Residential loans held for sale
Assets
Loans held for sale, at fair value		4,208	3,416
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		4,208	3,416
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		96	148
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		96	148
Commercial loans held for sale | Level 3
Assets
Loans held for sale, at fair value		0	0
Residential mortgages
Assets
Mortgage servicing rights		893	658
Residential mortgages | Level 1
Assets
Mortgage servicing rights		0	0
Residential mortgages | Level 2
Assets
Mortgage servicing rights		0	0
Residential mortgages | Level 3
Assets
Mortgage servicing rights		$ 893	$ 658
[1] Includes only collateral pledged by the Company where counterparties have the right to sell or pledge the collateral.

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