LOANS - Credit Quality Indicators (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Loans receivable
Total	$ 657,221	$ 667,767
Consumer
Loans receivable
Total	368,067	376,534
Consumer | Equal to greater than 90 days past due
Loans receivable
Total	2,153	1,963
Consumer | In North America offices
Loans receivable
Total	289,014	263,687
Consumer | In North America offices | Equal to greater than 90 days past due
Loans receivable
Total	1,888	1,542
Consumer | In North America offices | Equal to greater than 90 days past due | Personal Banking and Wealth Management
Loans receivable
Total	31,500	35,300
Consumer | In offices outside North America
Loans receivable
Total	79,053	112,847
Consumer | In offices outside North America | Equal to greater than 90 days past due
Loans receivable
Total	265	421
Consumer | In offices outside North America | Equal to greater than 90 days past due | Personal Banking and Wealth Management
Loans receivable
Total	17,800	24,500
Consumer | Residential first mortgages
Loans receivable
Total	96,039	83,361
Consumer | Residential first mortgages | In North America offices
Loans receivable
Total	96,039	83,361
Consumer | Residential first mortgages | In North America offices | Equal to greater than 90 days past due
Loans receivable
Total	316	499
Consumer | Residential first mortgages | In offices outside North America
Loans receivable
Total	28,114	37,889
Consumer | Residential first mortgages | In offices outside North America | Equal to greater than 90 days past due
Loans receivable
Total	106	158
Consumer | Home equity loans
Loans receivable
Total	4,580	5,745
Consumer | Home equity loans | In North America offices
Loans receivable
Total	4,580	5,745
Consumer | Home equity loans | In North America offices | Equal to greater than 90 days past due
Loans receivable
Total	135	156
Consumer | Credit cards
Loans receivable
Total	150,098	133,351
Consumer | Credit cards | In North America offices
Loans receivable
Total	150,643	133,868
Consumer | Credit cards | In North America offices | Equal to greater than 90 days past due
Loans receivable
Total	1,415	871
Consumer | Credit cards | In offices outside North America
Loans receivable
Total	12,955	17,808
Consumer | Credit cards | In offices outside North America | Equal to greater than 90 days past due
Loans receivable
Total	149	188
Consumer | Credit cards | Outside U.S.
Loans receivable
Revolving loans converted to term loans	75	313
Consumer | Personal, small business and other
Loans receivable
Revolving loans converted to term loans	67	74
Total	36,812	39,806
Consumer | Personal, small business and other | In North America offices
Loans receivable
Total	37,752	40,713
Consumer | Personal, small business and other | In North America offices | Equal to greater than 90 days past due
Loans receivable
Total	22	16
Consumer | Personal, small business and other | In offices outside North America
Loans receivable
Total	$ 37,984	$ 57,150
Consumer | Personal, small business and other | In offices outside North America | Internal Investment Grade
Loans receivable
Percentage internal risk rating	98.00%	95.00%
Consumer | Personal, small business and other | In offices outside North America | Equal to greater than 90 days past due
Loans receivable
Total	$ 10	$ 75
Consumer | Less than or equal to 80%
Loans receivable
Total	90,741	83,339
Consumer | Less than or equal to 80% | Residential first mortgages
Loans receivable
Current fiscal year	15,644	18,107
One year prior to current fiscal year	19,104	18,715
Two years prior to current fiscal year	16,935	10,047
Three years prior to current fiscal year	8,789	4,117
Four years prior to current fiscal year	3,598	4,804
Prior	22,367	22,161
Total	86,437	77,951
Consumer | Less than or equal to 80% | Residential first mortgages | In offices outside North America
Loans receivable
Current fiscal year	3,106	6,334
One year prior to current fiscal year	4,144	5,996
Two years prior to current fiscal year	3,293	5,293
Three years prior to current fiscal year	3,048	3,729
Four years prior to current fiscal year	2,074	2,739
Prior	9,201	12,190
Total	$ 24,866	$ 36,281
Loan to value ratio	51.00%	46.00%
Consumer | Less than or equal to 80% | Home equity loans (pre-reset)
Loans receivable
Total	$ 3,677	$ 2,637
Consumer | Less than or equal to 80% | Home equity loans (post-reset)
Loans receivable
Total	627	2,751
Consumer | Less than or equal to 80% | Home equity loans
Loans receivable
Total	4,304	5,388
Consumer | 80% but less than or equal to 100%
Loans receivable
Total	8,385	3,903
Consumer | 80% but less than or equal to 100% | Residential first mortgages
Loans receivable
Current fiscal year	6,497	2,723
One year prior to current fiscal year	1,227	446
Two years prior to current fiscal year	267	269
Three years prior to current fiscal year	140	136
Four years prior to current fiscal year	74	103
Prior	132	128
Total	8,337	3,805
Consumer | 80% but less than or equal to 100% | Residential first mortgages | In offices outside North America
Loans receivable
Current fiscal year	975	989
One year prior to current fiscal year	964	292
Two years prior to current fiscal year	502	116
Three years prior to current fiscal year	92	32
Four years prior to current fiscal year	48	38
Prior	36	102
Total	2,617	1,569
Consumer | 80% but less than or equal to 100% | Home equity loans (pre-reset)
Loans receivable
Total	36	46
Consumer | 80% but less than or equal to 100% | Home equity loans (post-reset)
Loans receivable
Total	12	52
Consumer | 80% but less than or equal to 100% | Home equity loans
Loans receivable
Total	48	98
Consumer | Greater than 100%
Loans receivable
Total	263	193
Consumer | Greater than 100% | Residential first mortgages
Loans receivable
Current fiscal year	40	34
One year prior to current fiscal year	33	0
Two years prior to current fiscal year	1	29
Three years prior to current fiscal year	23	11
Four years prior to current fiscal year	9	4
Prior	74	14
Total	180	92
Consumer | Greater than 100% | Residential first mortgages | In offices outside North America
Loans receivable
Current fiscal year	294	0
One year prior to current fiscal year	273	0
Two years prior to current fiscal year	25	1
Three years prior to current fiscal year	1	0
Four years prior to current fiscal year	0	0
Prior	7	14
Total	600	15
Consumer | Greater than 100% | Home equity loans (pre-reset)
Loans receivable
Total	56	69
Consumer | Greater than 100% | Home equity loans (post-reset)
Loans receivable
Total	27	32
Consumer | Greater than 100% | Home equity loans
Loans receivable
Total	83	101
Consumer | LTV not available
Loans receivable
Total	1,230	1,671
Consumer | LTV not available | Residential first mortgages
Loans receivable
Total	1,085	1,513
Consumer | LTV not available | Residential first mortgages | In offices outside North America
Loans receivable
Total	31	24
Consumer | LTV not available | Home equity loans
Loans receivable
Total	145	158
Consumer | Total
Loans receivable
Total	100,619	89,106
Consumer | Less than 680
Loans receivable
Total	34,306	28,598
Consumer | Less than 680 | Residential first mortgages
Loans receivable
Current fiscal year	691	626
One year prior to current fiscal year	639	508
Two years prior to current fiscal year	431	373
Three years prior to current fiscal year	321	394
Four years prior to current fiscal year	302	343
Prior	2,020	2,053
Total	4,404	4,297
Consumer | Less than 680 | Home equity loans (pre-reset)
Loans receivable
Total	552	659
Consumer | Less than 680 | Home equity loans (post-reset)
Loans receivable
Total	62	75
Consumer | Less than 680 | Home equity term loans
Loans receivable
Current fiscal year	0	0
One year prior to current fiscal year	0	0
Two years prior to current fiscal year	1	1
Three years prior to current fiscal year	1	1
Four years prior to current fiscal year	1	1
Prior	103	165
Total	106	168
Consumer | Less than 680 | Home equity loans
Loans receivable
Total	720	902
Consumer | Less than 680 | Credit cards
Loans receivable
Total	27,901	22,342
Consumer | Less than 680 | Credit cards
Loans receivable
Revolving loans converted to term loans	766	773
Total	28,667	23,115
Consumer | Less than 680 | Credit cards | Canada
Loans receivable
Total	545	517
Consumer | Less than 680 | Personal, small business and other
Loans receivable
Current fiscal year	247	59
One year prior to current fiscal year	96	22
Two years prior to current fiscal year	15	42
Three years prior to current fiscal year	21	34
Four years prior to current fiscal year	10	7
Prior	126	120
Total	515	284
Consumer | Less than 680 | Personal, small business and other | Canada
Loans receivable
Total	940	907
Consumer | 680 to 760
Loans receivable
Total	89,490	79,581
Consumer | 680 to 760 | Residential first mortgages
Loans receivable
Current fiscal year	7,530	6,729
One year prior to current fiscal year	5,933	5,102
Two years prior to current fiscal year	4,621	3,074
Three years prior to current fiscal year	2,505	1,180
Four years prior to current fiscal year	1,072	1,455
Prior	6,551	6,540
Total	28,212	24,080
Consumer | 680 to 760 | Home equity loans (pre-reset)
Loans receivable
Total	1,536	1,795
Consumer | 680 to 760 | Home equity loans (post-reset)
Loans receivable
Total	65	72
Consumer | 680 to 760 | Home equity term loans
Loans receivable
Current fiscal year	0	1
One year prior to current fiscal year	1	3
Two years prior to current fiscal year	2	2
Three years prior to current fiscal year	2	2
Four years prior to current fiscal year	2	2
Prior	144	201
Total	151	210
Consumer | 680 to 760 | Home equity loans
Loans receivable
Total	1,752	2,077
Consumer | 680 to 760 | Credit cards
Loans receivable
Total	58,213	52,481
Consumer | 680 to 760 | Credit cards
Loans receivable
Revolving loans converted to term loans	354	426
Total	58,567	52,907
Consumer | 680 to 760 | Personal, small business and other
Loans receivable
Current fiscal year	546	201
One year prior to current fiscal year	170	41
Two years prior to current fiscal year	20	53
Three years prior to current fiscal year	23	35
Four years prior to current fiscal year	10	8
Prior	190	179
Total	959	517
Consumer | Greater than 760
Loans receivable
Total	120,733	106,515
Consumer | Greater than 760 | Residential first mortgages
Loans receivable
Current fiscal year	12,928	12,349
One year prior to current fiscal year	12,672	12,153
Two years prior to current fiscal year	10,936	6,167
Three years prior to current fiscal year	5,445	2,216
Four years prior to current fiscal year	1,899	2,568
Prior	12,649	12,586
Total	56,529	48,039
Consumer | Greater than 760 | Home equity loans (pre-reset)
Loans receivable
Total	1,876	2,506
Consumer | Greater than 760 | Home equity loans (post-reset)
Loans receivable
Total	40	37
Consumer | Greater than 760 | Home equity term loans
Loans receivable
Current fiscal year	0	1
One year prior to current fiscal year	1	2
Two years prior to current fiscal year	2	2
Three years prior to current fiscal year	2	1
Four years prior to current fiscal year	1	2
Prior	111	149
Total	117	156
Consumer | Greater than 760 | Home equity loans
Loans receivable
Total	2,033	2,699
Consumer | Greater than 760 | Credit cards
Loans receivable
Total	60,896	55,076
Consumer | Greater than 760 | Credit cards
Loans receivable
Revolving loans converted to term loans	54	61
Total	60,950	55,137
Consumer | Greater than 760 | Personal, small business and other
Loans receivable
Current fiscal year	800	319
One year prior to current fiscal year	210	64
Two years prior to current fiscal year	30	68
Three years prior to current fiscal year	28	37
Four years prior to current fiscal year	9	9
Prior	144	143
Total	1,221	640
Consumer | Classifiably managed
Loans receivable
Total	31,478	35,324
Consumer | Classifiably managed | In offices outside North America
Loans receivable
Total	17,762	24,482
Consumer | Classifiably managed | Residential first mortgages
Loans receivable
Total
Consumer | Classifiably managed | Residential first mortgages | In offices outside North America
Loans receivable
Total	0	0
Consumer | Classifiably managed | Home equity loans
Loans receivable
Total
Consumer | Classifiably managed | Credit cards
Loans receivable
Total
Consumer | Classifiably managed | Credit cards | In offices outside North America
Loans receivable
Total	0	0
Consumer | Classifiably managed | Personal, small business and other
Loans receivable
Total	31,478	35,324
Consumer | Classifiably managed | Personal, small business and other | In offices outside North America
Loans receivable
Total	17,762	24,482
Consumer | FICO not available
Loans receivable
Total	11,522	12,245
Consumer | FICO not available | Residential first mortgages
Loans receivable
Total	6,894	6,945
Consumer | FICO not available | Home equity loans
Loans receivable
Total	75	67
Consumer | FICO not available | Credit cards
Loans receivable
Total	1,914	2,192
Consumer | FICO not available | Personal, small business and other
Loans receivable
Total	2,639	3,041
Consumer | Total loans
Loans receivable
Total	$ 287,529	$ 262,263