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Allowance for Credit Losses and Reserve for Unfunded Lending Commitments - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Mar. 31, 2023 | Jan. 01, 2023 | Dec. 31, 2022 | Mar. 31, 2022 | Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Allowance for credit loss | $ 14,318 |  | $ 13,240 |  |
Allowance for credit losses |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Increase (Decrease) in Allowance for Credit Loss | 1,100 |  |  |  |
Allowance for credit loss | 14,318 | $ 13,177 | 13,240 | $ 11,308 | $ 11,430
Credit Card | Allowance for credit losses |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Allowance for credit loss | 10,410 | 9,482 | 9,545 | 8,280 | 8,345
Consumer Banking | Allowance for credit losses |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Allowance for credit loss | 2,205 | 2,237 | 2,237 | 1,902 | 1,918
Commercial Banking | Allowance for credit losses |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Allowance for credit loss | $ 1,703 | $ 1,458 | $ 1,458 | $ 1,126 | $ 1,167

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- Definition Amount excluding accrued interest, of allowance for credit loss on financing receivable. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 45 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=124255206&loc=SL82895884-210446 + Details
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