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SECURITIES - Schedule of Investments (Details) - USD ($) $ in Millions		Dec. 31, 2020	Dec. 31, 2019
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items]
Debt Securities Available-for-Sale, Amortized Cost		$ 22,364	$ 20,517
Debt Securities Available-for-Sale, Gross Unrealized Gains		597	167
Debt Securities Available-for-Sale, Gross Unrealized Losses		(19)	(71)
Debt securities available for sale:	[1]	22,942	20,613
Debt Securities Held-to-Maturity, Amortized Cost	[1]	3,235	3,202
Debt Securities Held-to-Maturity, Gross Unrealized Gain		122	45
Debt Securities Held-to-Maturity, Gross Unrealized Losses		0	(5)
Debt Securities Held-to-Maturity, Fair Value		3,357	3,242
Equity Securities, at Fair Value, Amortized Cost		66	47
Equity securities, at fair value		66	47
Other investment securities, at cost, carrying value		604	807
Other investment securities, at cost, estimated fair value		604	807
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	71
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:		11	71
State and political subdivisions
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items]
Debt Securities Available-for-Sale, Amortized Cost		3	5
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:		3	5
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		21,954	19,803
Debt Securities Available-for-Sale, Gross Unrealized Gains		571	143
Debt Securities Available-for-Sale, Gross Unrealized Losses		(19)	(71)
Debt securities available for sale:		22,506	19,875
Debt Securities Held-to-Maturity, Amortized Cost		2,342	3,202
Debt Securities Held-to-Maturity, Gross Unrealized Gain		122	45
Debt Securities Held-to-Maturity, Gross Unrealized Losses		0	(5)
Debt Securities Held-to-Maturity, Fair Value		2,464	3,242
Other/non-agency
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items]
Debt Securities Available-for-Sale, Amortized Cost		396	638
Debt Securities Available-for-Sale, Gross Unrealized Gains		26	24
Debt Securities Available-for-Sale, Gross Unrealized Losses		0	0
Debt securities available for sale:		422	662
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		22,350	20,441
Debt Securities Available-for-Sale, Gross Unrealized Gains		597	167
Debt Securities Available-for-Sale, Gross Unrealized Losses		(19)	(71)
Debt securities available for sale:		22,928	20,537
Debt Securities Held-to-Maturity, Amortized Cost		2,342	3,202
Debt Securities Held-to-Maturity, Gross Unrealized Gain		122	45
Debt Securities Held-to-Maturity, Gross Unrealized Losses		0	(5)
Debt Securities Held-to-Maturity, Fair Value		2,464	3,242
Asset-backed securities
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items]
Debt Securities Held-to-Maturity, Amortized Cost		893	0
Debt Securities Held-to-Maturity, Gross Unrealized Gain		0	0
Debt Securities Held-to-Maturity, Gross Unrealized Losses		0	0
Debt Securities Held-to-Maturity, Fair Value		$ 893	$ 0
[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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