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BORROWED FUNDS - Long Term Debt (Details) $ in Millions	1 Months Ended
	Sep. 30, 2020 USD ($) note	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Debt Instrument [Line Items]
Long-term borrowed funds		$ 8,346	$ 14,047
Private Exchange Offers
Debt Instrument [Line Items]
Principal amount	$ 621
Number of outstanding subordinated notes exchanged | note	5
Payment for tender offers	$ 11
Parent company
Debt Instrument [Line Items]
Long-term borrowed funds		3,441
Parent company | Subordinated Debt | 4.150% fixed rate subordinated debt, due 2022
Debt Instrument [Line Items]
Long-term borrowed funds		$ 182	348
Interest rate		4.15%
Parent company | Subordinated Debt | 3.750% fixed rate subordinated debt due 2024
Debt Instrument [Line Items]
Long-term borrowed funds		$ 159	250
Interest rate		3.75%
Parent company | Subordinated Debt | 4.023% fixed rate subordinated debt, due 2024
Debt Instrument [Line Items]
Long-term borrowed funds		$ 25	42
Interest rate		4.023%
Parent company | Subordinated Debt | 4.350% fixed rate subordinated debt, due 2025
Debt Instrument [Line Items]
Long-term borrowed funds		$ 193	249
Interest rate		4.35%
Parent company | Subordinated Debt | 4.300% fixed rate subordinated debt, due 2025
Debt Instrument [Line Items]
Long-term borrowed funds		$ 450	750
Interest rate		4.30%
Parent company | Subordinated Debt | 2.638% fixed-rate subordinated debt, due September 2032
Debt Instrument [Line Items]
Long-term borrowed funds		$ 543	0
Interest rate	2.638%	2.638%
Parent company | Senior Unsecured Notes | 2.375% fixed rate senior unsecured debt, due 2021
Debt Instrument [Line Items]
Long-term borrowed funds		$ 350	349
Interest rate		2.375%
Parent company | Senior Unsecured Notes | 2.850% fixed-rate senior unsecured notes, due July 2026
Debt Instrument [Line Items]
Long-term borrowed funds		$ 497	496
Interest rate		2.85%
Parent company | Senior Unsecured Notes | 2.500% fixed-rate senior unsecured notes, due February 2030
Debt Instrument [Line Items]
Long-term borrowed funds		$ 297	0
Interest rate		2.50%
Parent company | Senior Unsecured Notes | 3.250% fixed-rate senior unsecured notes, due April 2030
Debt Instrument [Line Items]
Long-term borrowed funds		$ 745	0
Interest rate		3.25%
CBNA and Other Subsidiaries
Debt Instrument [Line Items]
Long-term borrowed funds		$ 4,905
CBNA and Other Subsidiaries | Senior Unsecured Notes | 2.250% senior unsecured notes, due 2020
Debt Instrument [Line Items]
Long-term borrowed funds		$ 0	700
Interest rate		2.25%
CBNA and Other Subsidiaries | Senior Unsecured Notes | 2.447% floating-rate senior unsecured notes, due March 2020
Debt Instrument [Line Items]
Long-term borrowed funds		$ 0	300
Interest rate		2.447%
CBNA and Other Subsidiaries | Senior Unsecured Notes | 2.487% floating-rate senior unsecured notes, due May 2020
Debt Instrument [Line Items]
Long-term borrowed funds		$ 0	250
Interest rate		2.487%
CBNA and Other Subsidiaries | Senior Unsecured Notes | 2.200% senior unsecured notes, due 2020
Debt Instrument [Line Items]
Long-term borrowed funds		$ 0	500
Interest rate		2.20%
CBNA and Other Subsidiaries | Senior Unsecured Notes | 2.250% senior unsecured notes, due 2020
Debt Instrument [Line Items]
Long-term borrowed funds		$ 0	750
Interest rate		2.25%
CBNA and Other Subsidiaries | Senior Unsecured Notes | 2.550% senior unsecured notes, due May 2021
Debt Instrument [Line Items]
Long-term borrowed funds		$ 1,003	991
Interest rate		2.55%
CBNA and Other Subsidiaries | Senior Unsecured Notes | 3.250% senior unsecured notes, due February 2022
Debt Instrument [Line Items]
Long-term borrowed funds		$ 716	711
Interest rate		3.25%
CBNA and Other Subsidiaries | Senior Unsecured Notes | 0.941% Floating Rate Senior Unsecured Notes Due February 2022
Debt Instrument [Line Items]
Long-term borrowed funds		$ 299	299
Interest rate		0.941%
CBNA and Other Subsidiaries | Senior Unsecured Notes | 1.042% Floating Rate Senior Unsecured Notes Due May 2022
Debt Instrument [Line Items]
Long-term borrowed funds		$ 250	250
Interest rate		1.042%
CBNA and Other Subsidiaries | Senior Unsecured Notes | 2.650% senior unsecured notes, due May 2022
Debt Instrument [Line Items]
Long-term borrowed funds		$ 510	501
Interest rate		2.65%
CBNA and Other Subsidiaries | Senior Unsecured Notes | 3.700% senior unsecured notes, due March 2023
Debt Instrument [Line Items]
Long-term borrowed funds		$ 527	515
Interest rate		3.70%
CBNA and Other Subsidiaries | Senior Unsecured Notes | 1.201% Floating Rate Senior Unsecured Notes Due March 2023
Debt Instrument [Line Items]
Long-term borrowed funds		$ 249	249
Interest rate		1.201%
CBNA and Other Subsidiaries | Senior Unsecured Notes | 2.250% senior unsecured notes, due April 2025
Debt Instrument [Line Items]
Long-term borrowed funds		$ 746	0
Interest rate		2.25%
CBNA and Other Subsidiaries | Senior Unsecured Notes | 3.750% senior unsecured notes, due February 2026
Debt Instrument [Line Items]
Long-term borrowed funds		$ 551	521
Interest rate		3.75%
CBNA and Other Subsidiaries | Federal Home Loan advances
Debt Instrument [Line Items]
Long-term borrowed funds		$ 19	5,008
Weighted average interest rate		0.932%
CBNA and Other Subsidiaries | Other
Debt Instrument [Line Items]
Long-term borrowed funds		$ 35	$ 18

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