LOANS - Consumer Loans Outside of North America (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Loans receivable
Total loans	$ 657,221	$ 667,767
Consumer
Loans receivable
Total loans	368,067	376,534
Consumer | 30 to 89 days past due
Loans receivable
Total loans	2,372	1,999
Consumer | Equal to greater than 90 days past due
Loans receivable
Total loans	2,153	1,963
Consumer | Classifiably managed
Loans receivable
Total loans	31,478	35,324
Consumer | Residential first mortgages
Loans receivable
Total loans	96,039	83,361
Consumer | Residential first mortgages | Classifiably managed
Loans receivable
Total loans
Consumer | Credit cards
Loans receivable
Total loans	150,098	133,351
Consumer | Credit cards | Classifiably managed
Loans receivable
Total loans
Consumer | Personal, small business and other
Loans receivable
Total loans	36,812	39,806
Consumer | Personal, small business and other | Classifiably managed
Loans receivable
Total loans	31,478	35,324
In offices outside North America | Consumer
Loans receivable
Total loans	$ 79,053	$ 112,847
NCL ratio	0.91%	0.88%
In offices outside North America | Consumer | 30 to 89 days past due
Loans receivable
Total loans	$ 314	$ 502
Past due ratio	0.51%	0.57%
In offices outside North America | Consumer | Equal to greater than 90 days past due
Loans receivable
Total loans	$ 265	$ 421
Past due ratio	0.43%	0.48%
In offices outside North America | Consumer | Classifiably managed
Loans receivable
Total loans	$ 17,762	$ 24,482
In offices outside North America | Consumer | FICO Score, Delinquency Managed Loans
Loans receivable
Total loans	61,291	88,365
In offices outside North America | Consumer | Classifiably managed
Loans receivable
Total loans	80,500	114,300
In offices outside North America | Consumer | Residential first mortgages
Loans receivable
Total loans	$ 28,114	$ 37,889
NCL ratio	0.10%	0.08%
In offices outside North America | Consumer | Residential first mortgages | 30 to 89 days past due
Loans receivable
Total loans	$ 62	$ 165
Past due ratio	0.22%	0.44%
In offices outside North America | Consumer | Residential first mortgages | Equal to greater than 90 days past due
Loans receivable
Total loans	$ 106	$ 158
Past due ratio	0.38%	0.42%
In offices outside North America | Consumer | Residential first mortgages | Classifiably managed
Loans receivable
Total loans	$ 0	$ 0
In offices outside North America | Consumer | Residential first mortgages | FICO Score, Delinquency Managed Loans
Loans receivable
Total loans	28,114	37,889
In offices outside North America | Consumer | Residential first mortgages | Global Wealth Management Business
Loans receivable
Total loans	19,800	19,800
In offices outside North America | Consumer | Credit cards
Loans receivable
Total loans	$ 12,955	$ 17,808
NCL ratio	3.18%	3.06%
In offices outside North America | Consumer | Credit cards | 30 to 89 days past due
Loans receivable
Total loans	$ 147	$ 192
Past due ratio	1.13%	1.08%
In offices outside North America | Consumer | Credit cards | Equal to greater than 90 days past due
Loans receivable
Total loans	$ 149	$ 188
Past due ratio	1.15%	1.06%
In offices outside North America | Consumer | Credit cards | Classifiably managed
Loans receivable
Total loans	$ 0	$ 0
In offices outside North America | Consumer | Credit cards | FICO Score, Delinquency Managed Loans
Loans receivable
Total loans	12,955	17,808
In offices outside North America | Consumer | Personal, small business and other
Loans receivable
Total loans	$ 37,984	$ 57,150
NCL ratio	0.76%	0.72%
In offices outside North America | Consumer | Personal, small business and other | Internal Investment Grade
Loans receivable
Percentage internal risk rating	98.00%	95.00%
In offices outside North America | Consumer | Personal, small business and other | 30 to 89 days past due
Loans receivable
Total loans	$ 105	$ 145
Past due ratio	0.52%	0.44%
In offices outside North America | Consumer | Personal, small business and other | Equal to greater than 90 days past due
Loans receivable
Total loans	$ 10	$ 75
Past due ratio	0.05%	0.23%
In offices outside North America | Consumer | Personal, small business and other | Classifiably managed
Loans receivable
Total loans	$ 17,762	$ 24,482
In offices outside North America | Consumer | Personal, small business and other | FICO Score, Delinquency Managed Loans
Loans receivable
Total loans	20,222	32,668
In offices outside North America | Consumer | Personal, small business and other | Global Wealth Management Business
Loans receivable
Total loans	$ 26,600	$ 34,600
In offices outside North America | Consumer | Personal, small business and other | Global Wealth Management Business | Internal Investment Grade
Loans receivable
Percentage internal risk rating	94.00%	94.00%
In offices outside North America | Consumer | Personal, small business and other | Global Wealth Management Business | Classifiably managed
Loans receivable
Total loans	$ 17,800	$ 24,500
In offices outside North America | Consumer | Personal, small business and other | Global Wealth Management Business | Classifiably managed
Loans receivable
Total loans	$ 26,600	$ 34,600