Quarterly report pursuant to Section 13 or 15(d)

Outstanding Loans and Leases and Allowance for Credit Losses - Residential Mortgage - Credit Quality Indicators (Details)

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Outstanding Loans and Leases and Allowance for Credit Losses - Residential Mortgage - Credit Quality Indicators (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 2023
Financing Receivable, Credit Quality Indicator [Line Items]          
Total $ 1,056,785   $ 1,056,785   $ 1,053,732
Total gross charge-offs 1,779 $ 1,125 3,517 $ 2,180  
Small Business Card Loans | United States          
Financing Receivable, Credit Quality Indicator [Line Items]          
Total gross charge-offs     234   317
Consumer real estate          
Financing Receivable, Credit Quality Indicator [Line Items]          
Total gross charge-offs 8 $ 15 19 $ 29  
Consumer real estate | Residential Mortgage          
Financing Receivable, Credit Quality Indicator [Line Items]          
Total 227,870   227,870   228,403
Originated in current fiscal year 9,159   9,159   16,726
Originated in fiscal year before current fiscal year 15,332   15,332   39,828
Originated two years before current fiscal year 38,794   38,794   80,030
Originated three years before current fiscal year 77,632   77,632   37,990
Originated four years before current fiscal year 36,585   36,585   18,318
Prior 50,368   50,368   35,511
Total gross charge-offs     13   67
Gross charge-offs, Originated in current fiscal year     0   0
Gross charge-offs, Originated in fiscal year before current fiscal year     1   7
Gross charge-offs, Originated two years before current fiscal year     2   12
Gross charge-offs, Originated three years before current fiscal year     2   6
Gross charge-offs, Originated four years before current fiscal year     1   2
Gross charge-offs, Prior     7   40
Consumer real estate | Less than 620 | Residential Mortgage          
Financing Receivable, Credit Quality Indicator [Line Items]          
Total 2,449   2,449   2,335
Originated in current fiscal year 75   75   115
Originated in fiscal year before current fiscal year 139   139   471
Originated two years before current fiscal year 479   479   589
Originated three years before current fiscal year 626   626   402
Originated four years before current fiscal year 406   406   136
Prior 724   724   622
Consumer real estate | Greater than or equal to 620 and less than 680 | Residential Mortgage          
Financing Receivable, Credit Quality Indicator [Line Items]          
Total 4,588   4,588   4,671
Originated in current fiscal year 127   127   359
Originated in fiscal year before current fiscal year 359   359   919
Originated two years before current fiscal year 888   888   1,235
Originated three years before current fiscal year 1,181   1,181   777
Originated four years before current fiscal year 716   716   296
Prior 1,317   1,317   1,085
Consumer real estate | Greater than or equal to 680 and less than 740 | Residential Mortgage          
Financing Receivable, Credit Quality Indicator [Line Items]          
Total 22,503   22,503   23,357
Originated in current fiscal year 847   847   1,934
Originated in fiscal year before current fiscal year 1,827   1,827   4,652
Originated two years before current fiscal year 4,165   4,165   6,988
Originated three years before current fiscal year 6,511   6,511   3,742
Originated four years before current fiscal year 3,541   3,541   1,836
Prior 5,612   5,612   4,205
Consumer real estate | Greater than or equal to 740 | Residential Mortgage          
Financing Receivable, Credit Quality Indicator [Line Items]          
Total 187,836   187,836   187,077
Originated in current fiscal year 7,775   7,775   13,778
Originated in fiscal year before current fiscal year 12,767   12,767   33,436
Originated two years before current fiscal year 32,942   32,942   67,803
Originated three years before current fiscal year 66,027   66,027   30,235
Originated four years before current fiscal year 29,219   29,219   15,203
Prior 39,106   39,106   26,622
Less than or equal to 90 percent | Consumer real estate | Residential Mortgage          
Financing Receivable, Credit Quality Indicator [Line Items]          
Total 214,338   214,338   214,661
Originated in current fiscal year 8,287   8,287   15,224
Originated in fiscal year before current fiscal year 14,200   14,200   38,225
Originated two years before current fiscal year 37,386   37,386   76,229
Originated three years before current fiscal year 74,005   74,005   35,072
Originated four years before current fiscal year 33,814   33,814   17,432
Prior 46,646   46,646   32,479
Greater than 90 percent but less than or equal to 100 percent | Consumer real estate | Residential Mortgage          
Financing Receivable, Credit Quality Indicator [Line Items]          
Total 2,118   2,118   1,994
Originated in current fiscal year 337   337   698
Originated in fiscal year before current fiscal year 620   620   911
Originated two years before current fiscal year 786   786   286
Originated three years before current fiscal year 258   258   53
Originated four years before current fiscal year 45   45   25
Prior 72   72   21
Greater than 100 percent | Consumer real estate | Residential Mortgage          
Financing Receivable, Credit Quality Indicator [Line Items]          
Total 920   920   785
Originated in current fiscal year 200   200   264
Originated in fiscal year before current fiscal year 272   272   342
Originated two years before current fiscal year 302   302   100
Originated three years before current fiscal year 82   82   31
Originated four years before current fiscal year 23   23   14
Prior 41   41   34
Fully-insured loans | Consumer real estate | Residential Mortgage          
Financing Receivable, Credit Quality Indicator [Line Items]          
Total 10,494   10,494   10,963
Originated in current fiscal year 335   335   540
Originated in fiscal year before current fiscal year 240   240   350
Originated two years before current fiscal year 320   320   3,415
Originated three years before current fiscal year 3,287   3,287   2,834
Originated four years before current fiscal year 2,703   2,703   847
Prior $ 3,609   $ 3,609   $ 2,977