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SECURITIES - Schedule of Investments (Details) - USD ($) $ in Millions		Mar. 31, 2021	Dec. 31, 2020
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items]
Debt Securities Available-for-sale, Fair Value	[1]	$ 24,467	$ 22,942
Debt Securities Held-to-maturity, Amortized Cost	[1]	2,995	3,235
Debt Securities Held-to-maturity, Gross Unrealized Gain		84	122
Debt Securities Held-to-maturity, Gross Unrealized Losses		(2)	0
Debt Securities held-to-maturity, Fair Value		3,077	3,357
Equity Securities, Amortized Cost		73	66
Equity Securities, Fair Value		73	66
Total equity securities, at cost, Amortized Cost		603	604
Equity securities, at cost, fair value		603	604
U.S. Treasury and other
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items]
Debt Securities Available-for-sale, Amortized Cost		11	11
Debt Securities Available-for-sale, Gross Unrealized Gains		0	0
Debt Securities Available-for-sale, Gross Unrealized Losses		0	0
Debt Securities Available-for-sale, Fair Value		11	11
State and political subdivisions
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items]
Debt Securities Available-for-sale, Amortized Cost		3	3
Debt Securities Available-for-sale, Gross Unrealized Gains		0	0
Debt Securities Available-for-sale, Gross Unrealized Losses		0	0
Debt Securities Available-for-sale, Fair Value		3	3
Federal agencies and U.S. government sponsored entities
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items]
Debt Securities Available-for-sale, Amortized Cost		23,966	21,954
Debt Securities Available-for-sale, Gross Unrealized Gains		415	571
Debt Securities Available-for-sale, Gross Unrealized Losses		(268)	(19)
Debt Securities Available-for-sale, Fair Value		24,113	22,506
Debt Securities Held-to-maturity, Amortized Cost		2,139	2,342
Debt Securities Held-to-maturity, Gross Unrealized Gain		84	122
Debt Securities Held-to-maturity, Gross Unrealized Losses		0	0
Debt Securities held-to-maturity, Fair Value		2,223	2,464
Other/non-agency
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items]
Debt Securities Available-for-sale, Amortized Cost		324	396
Debt Securities Available-for-sale, Gross Unrealized Gains		16	26
Debt Securities Available-for-sale, Gross Unrealized Losses		0	0
Debt Securities Available-for-sale, Fair Value		340	422
Total mortgage-backed securities, at fair value
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items]
Debt Securities Available-for-sale, Amortized Cost		24,290	22,350
Debt Securities Available-for-sale, Gross Unrealized Gains		431	597
Debt Securities Available-for-sale, Gross Unrealized Losses		(268)	(19)
Debt Securities Available-for-sale, Fair Value		24,453	22,928
Debt Securities Held-to-maturity, Amortized Cost		2,139	2,342
Debt Securities Held-to-maturity, Gross Unrealized Gain		84	122
Debt Securities Held-to-maturity, Gross Unrealized Losses		0	0
Debt Securities held-to-maturity, Fair Value		2,223	2,464
Total debt securities available for sale, at fair value
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items]
Debt Securities Available-for-sale, Amortized Cost		24,304	22,364
Debt Securities Available-for-sale, Gross Unrealized Gains		431	597
Debt Securities Available-for-sale, Gross Unrealized Losses		(268)	(19)
Debt Securities Available-for-sale, Fair Value		24,467	22,942
Asset-backed securities
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items]
Debt Securities Held-to-maturity, Amortized Cost		856	893
Debt Securities Held-to-maturity, Gross Unrealized Gain		0	0
Debt Securities Held-to-maturity, Gross Unrealized Losses		(2)	0
Debt Securities held-to-maturity, Fair Value		$ 854	$ 893
[1] Includes only collateral pledged by the Company where counterparties have the right to sell or pledge the collateral.

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Total Other Investment Securities At Cost, Amortized Cost Basis

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Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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