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Loans - Wholesale Loan Portfolio, Internal Risk Ratings (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Retained loans $ 1,264,093 $ 1,084,850 $ 1,280,870
Loans by origination year      
Total retained loans 1,264,093 1,084,850 1,280,870
Gross charge-offs by origination year      
Total gross charge-offs 2,381 1,451  
Wholesale      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Retained loans $ 667,761 604,324 $ 672,472
% of investment-grade to total retained loans 67.93%   68.23%
% of total criticized to total retained loans 3.79%   3.51%
% of criticized nonaccrual to total retained loans 0.44%   0.35%
Loans by origination year      
Total retained loans $ 667,761 604,324 $ 672,472
Gross charge-offs by origination year      
Total gross charge-offs 136 $ 105  
Wholesale | Investment-grade      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Retained loans 453,592   458,838
Loans by origination year      
Total retained loans 453,592   458,838
Wholesale | Total noninvestment-grade      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Retained loans 214,169   213,634
Loans by origination year      
Total retained loans 214,169   213,634
Wholesale | Noncriticized      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Retained loans 188,850   190,056
Loans by origination year      
Total retained loans 188,850   190,056
Wholesale | Criticized performing      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Retained loans 22,392   21,232
Loans by origination year      
Total retained loans 22,392   21,232
Wholesale | Criticized nonaccrual      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Retained loans 2,927   2,346
Loans by origination year      
Total retained loans 2,927   2,346
Wholesale | Secured by real estate      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Retained loans $ 163,184   $ 162,338
% of investment-grade to total retained loans 72.82%   74.17%
% of total criticized to total retained loans 5.53%   4.74%
% of criticized nonaccrual to total retained loans 0.36%   0.25%
Loans by origination year      
Term loans originated in 2024/2023 $ 2,889   $ 15,164
Term loans originated in 2023/2022 15,515   41,453
Term loans originated in 2022/2021 41,163   33,623
Term loans originated in 2021/2020 33,452   20,660
Term loans originated in 2020/2019 20,213   19,664
Term loans originated prior to 2020/2019 47,166   29,026
Revolving loans within the revolving period 2,785   2,746
Revolving loans converted to term loans 1   2
Total retained loans 163,184   162,338
Gross charge-offs by origination year      
Gross charge-offs originated in 2024/2023 0   20
Gross charge-offs originated in 2023/2022 5   48
Gross charge-offs originated in 2022/2021 20   22
Gross charge-offs originated in 2021/2020 0   0
Gross charge-offs originated in 2020/2019 0   23
Gross charge-offs originated prior to 2020/2019 3   78
Gross charge-offs originated within the revolving period 0   0
Gross charge-offs originated converted to term loans 0   1
Total gross charge-offs 28   192
Wholesale | Secured by real estate | Investment-grade      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Retained loans 118,829   120,405
Loans by origination year      
Term loans originated in 2024/2023 1,847   10,687
Term loans originated in 2023/2022 10,697   28,874
Term loans originated in 2022/2021 28,184   25,784
Term loans originated in 2021/2020 24,877   16,820
Term loans originated in 2020/2019 16,470   15,677
Term loans originated prior to 2020/2019 35,371   21,108
Revolving loans within the revolving period 1,383   1,455
Revolving loans converted to term loans 0   0
Total retained loans 118,829   120,405
Wholesale | Secured by real estate | Total noninvestment-grade      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Retained loans 44,355   41,933
Loans by origination year      
Term loans originated in 2024/2023 1,042   4,477
Term loans originated in 2023/2022 4,818   12,579
Term loans originated in 2022/2021 12,979   7,839
Term loans originated in 2021/2020 8,575   3,840
Term loans originated in 2020/2019 3,743   3,987
Term loans originated prior to 2020/2019 11,795   7,918
Revolving loans within the revolving period 1,402   1,291
Revolving loans converted to term loans 1   2
Total retained loans 44,355   41,933
Wholesale | Secured by real estate | Noncriticized      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Retained loans 35,333   34,241
Loans by origination year      
Total retained loans 35,333   34,241
Wholesale | Secured by real estate | Criticized performing      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Retained loans 8,431   7,291
Loans by origination year      
Total retained loans 8,431   7,291
Wholesale | Secured by real estate | Criticized nonaccrual      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Retained loans $ 591   $ 401
% of criticized nonaccrual to total retained loans 0.36%   0.25%
Loans by origination year      
Total retained loans $ 591   $ 401
Wholesale | Commercial and industrial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Retained loans $ 167,518   $ 167,166
% of investment-grade to total retained loans 42.57%   43.44%
% of total criticized to total retained loans 8.23%   8.32%
% of criticized nonaccrual to total retained loans 0.86%   0.73%
Loans by origination year      
Term loans originated in 2024/2023 $ 10,412   $ 33,765
Term loans originated in 2023/2022 25,270   27,086
Term loans originated in 2022/2021 25,015   13,575
Term loans originated in 2021/2020 12,516   4,280
Term loans originated in 2020/2019 3,412   2,174
Term loans originated prior to 2020/2019 3,613   2,121
Revolving loans within the revolving period 87,164   84,090
Revolving loans converted to term loans 116   75
Total retained loans 167,518   167,166
Gross charge-offs by origination year      
Gross charge-offs originated in 2024/2023 3   25
Gross charge-offs originated in 2023/2022 3   8
Gross charge-offs originated in 2022/2021 19   110
Gross charge-offs originated in 2021/2020 3   55
Gross charge-offs originated in 2020/2019 1   2
Gross charge-offs originated prior to 2020/2019 3   12
Gross charge-offs originated within the revolving period 43   259
Gross charge-offs originated converted to term loans 0   8
Total gross charge-offs 75   479
Wholesale | Commercial and industrial | Investment-grade      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Retained loans 71,308   72,624
Loans by origination year      
Term loans originated in 2024/2023 5,552   14,875
Term loans originated in 2023/2022 9,804   10,642
Term loans originated in 2022/2021 9,117   4,276
Term loans originated in 2021/2020 4,040   2,291
Term loans originated in 2020/2019 1,705   1,030
Term loans originated prior to 2020/2019 1,818   1,115
Revolving loans within the revolving period 39,229   38,394
Revolving loans converted to term loans 43   1
Total retained loans 71,308   72,624
Wholesale | Commercial and industrial | Total noninvestment-grade      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Retained loans 96,210   94,542
Loans by origination year      
Term loans originated in 2024/2023 4,860   18,890
Term loans originated in 2023/2022 15,466   16,444
Term loans originated in 2022/2021 15,898   9,299
Term loans originated in 2021/2020 8,476   1,989
Term loans originated in 2020/2019 1,707   1,144
Term loans originated prior to 2020/2019 1,795   1,006
Revolving loans within the revolving period 47,935   45,696
Revolving loans converted to term loans 73   74
Total retained loans 96,210   94,542
Wholesale | Commercial and industrial | Noncriticized      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Retained loans 82,426   80,637
Loans by origination year      
Total retained loans 82,426   80,637
Wholesale | Commercial and industrial | Criticized performing      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Retained loans 12,349   12,684
Loans by origination year      
Total retained loans 12,349   12,684
Wholesale | Commercial and industrial | Criticized nonaccrual      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Retained loans 1,435   1,221
Loans by origination year      
Total retained loans 1,435   1,221
Wholesale | Other      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Retained loans $ 337,059   $ 342,968
% of investment-grade to total retained loans 78.16%   77.50%
% of total criticized to total retained loans 0.75%   0.58%
% of criticized nonaccrual to total retained loans 0.27%   0.21%
Loans by origination year      
Term loans originated in 2024/2023 $ 13,887   $ 52,392
Term loans originated in 2023/2022 43,571   26,126
Term loans originated in 2022/2021 24,390   16,202
Term loans originated in 2021/2020 14,816   12,271
Term loans originated in 2020/2019 11,633   4,532
Term loans originated prior to 2020/2019 12,223   8,663
Revolving loans within the revolving period 214,338   220,529
Revolving loans converted to term loans 2,201   2,253
Total retained loans 337,059   342,968
Gross charge-offs by origination year      
Gross charge-offs originated in 2024/2023 0   5
Gross charge-offs originated in 2023/2022 7   298
Gross charge-offs originated in 2022/2021 0   8
Gross charge-offs originated in 2021/2020 18   8
Gross charge-offs originated in 2020/2019 7   0
Gross charge-offs originated prior to 2020/2019 1   8
Gross charge-offs originated within the revolving period 0   13
Gross charge-offs originated converted to term loans 0   0
Total gross charge-offs 33   340
Wholesale | Other | Individuals and individual entities      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Retained loans 105,200   106,900
Loans by origination year      
Total retained loans 105,200   106,900
Wholesale | Other | SPEs      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Retained loans 87,300   91,200
Loans by origination year      
Total retained loans 87,300   91,200
Wholesale | Other | Financial institutions      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Retained loans 85,100   87,500
Loans by origination year      
Total retained loans 85,100   87,500
Wholesale | Other | Investment-grade      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Retained loans 263,455   265,809
Loans by origination year      
Term loans originated in 2024/2023 10,191   38,338
Term loans originated in 2023/2022 32,625   18,034
Term loans originated in 2022/2021 17,015   10,033
Term loans originated in 2021/2020 9,037   10,099
Term loans originated in 2020/2019 9,635   3,721
Term loans originated prior to 2020/2019 9,691   6,662
Revolving loans within the revolving period 173,115   176,728
Revolving loans converted to term loans 2,146   2,194
Total retained loans 263,455   265,809
Wholesale | Other | Total noninvestment-grade      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Retained loans 73,604   77,159
Loans by origination year      
Term loans originated in 2024/2023 3,696   14,054
Term loans originated in 2023/2022 10,946   8,092
Term loans originated in 2022/2021 7,375   6,169
Term loans originated in 2021/2020 5,779   2,172
Term loans originated in 2020/2019 1,998   811
Term loans originated prior to 2020/2019 2,532   2,001
Revolving loans within the revolving period 41,223   43,801
Revolving loans converted to term loans 55   59
Total retained loans 73,604   77,159
Wholesale | Other | Noncriticized      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Retained loans 71,091   75,178
Loans by origination year      
Total retained loans 71,091   75,178
Wholesale | Other | Criticized performing      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Retained loans 1,612   1,257
Loans by origination year      
Total retained loans 1,612   1,257
Wholesale | Other | Criticized nonaccrual      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Retained loans 901   724
Loans by origination year      
Total retained loans $ 901   $ 724