LOANS - Schedule of Interest Income Recognized for Non-Accrual Consumer Loans (Details) - Consumer - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Financing Receivable, Nonaccrual [Line Items]
Interest income	$ 7	$ 5	$ 16	$ 16
In North America offices
Financing Receivable, Nonaccrual [Line Items]
Interest income	5	5	14	16
In offices outside North America
Financing Receivable, Nonaccrual [Line Items]
Interest income	2	0	2	0
Residential mortgages | In North America offices
Financing Receivable, Nonaccrual [Line Items]
Interest income	3	3	9	10
Residential mortgages | In offices outside North America
Financing Receivable, Nonaccrual [Line Items]
Interest income	2	0	2	0
Home equity loans | In North America offices
Financing Receivable, Nonaccrual [Line Items]
Interest income	1	2	3	6
Credit cards | In North America offices
Financing Receivable, Nonaccrual [Line Items]
Interest income	0	0	0	0
Credit cards | In offices outside North America
Financing Receivable, Nonaccrual [Line Items]
Interest income	0	0	0	0
Personal, small business and other | In North America offices
Financing Receivable, Nonaccrual [Line Items]
Interest income	1	0	2	0
Personal, small business and other | In offices outside North America
Financing Receivable, Nonaccrual [Line Items]
Interest income	$ 0	$ 0	$ 0	$ 0