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Allowance for Credit Losses and Reserve for Unfunded Lending Commitments - Allowance for Credit Losses and Reserve for Unfunded Lending Commitments Activity (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2025 | Mar. 31, 2024
Allowance for Credit Losses [Roll Forward] |  |
Balance at beginning of the period | $ 16,258 |
Provision for credit losses | 2,369 | $ 2,683
Allowance build for credit losses | (359) |
Balance at the end of the period | 15,899 |
Allowance for credit losses |  |
Allowance for Credit Losses [Roll Forward] |  |
Balance at beginning of the period | 16,258 | 15,296
Charge-offs | (3,692) | (3,273)
Recoveries | 956 | 657
Net charge-offs | (2,736) | (2,616)
Provision for credit losses | 2,368 | 2,707
Allowance build for credit losses | (368) | 91
Other changes | 9 | (7)
Balance at the end of the period | 15,899 | 15,380
Reserve for unfunded lending commitments |  |
Allowance for Credit Losses [Roll Forward] |  |
Balance at beginning of the period | 143 | 158
Provision for credit losses | 1 | (24)
Balance at the end of the period | 144 | 134
Combined allowance and reserve |  |
Allowance for Credit Losses [Roll Forward] |  |
Balance at the end of the period | 16,043 | 15,514
Credit Card: | Allowance for credit losses |  |
Allowance for Credit Losses [Roll Forward] |  |
Balance at beginning of the period | 12,974 | 11,709
Charge-offs | (2,978) | (2,574)
Recoveries | 579 | 367
Net charge-offs | (2,399) | (2,207)
Provision for credit losses | 1,926 | 2,259
Allowance build for credit losses | (473) | 52
Other changes | 9 | (7)
Balance at the end of the period | 12,510 | 11,754
Credit Card: | Reserve for unfunded lending commitments |  |
Allowance for Credit Losses [Roll Forward] |  |
Balance at beginning of the period | 0 | 0
Provision for credit losses | 0 | 0
Balance at the end of the period | 0 | 0
Credit Card: | Combined allowance and reserve |  |
Allowance for Credit Losses [Roll Forward] |  |
Balance at the end of the period | 12,510 | 11,754
Consumer Banking: | Allowance for credit losses |  |
Allowance for Credit Losses [Roll Forward] |  |
Balance at beginning of the period | 1,884 | 2,042
Charge-offs | (676) | (660)
Recoveries | 363 | 280
Net charge-offs | (313) | (380)
Provision for credit losses | 301 | 426
Allowance build for credit losses | (12) | 46
Other changes | 0 | 0
Balance at the end of the period | 1,872 | 2,088
Consumer Banking: | Reserve for unfunded lending commitments |  |
Allowance for Credit Losses [Roll Forward] |  |
Balance at beginning of the period | 0 | 0
Provision for credit losses | 0 | 0
Balance at the end of the period | 0 | 0
Consumer Banking: | Combined allowance and reserve |  |
Allowance for Credit Losses [Roll Forward] |  |
Balance at the end of the period | 1,872 | 2,088
Commercial Banking: | Allowance for credit losses |  |
Allowance for Credit Losses [Roll Forward] |  |
Balance at beginning of the period | 1,400 | 1,545
Charge-offs | (38) | (39)
Recoveries | 14 | 10
Net charge-offs | (24) | (29)
Provision for credit losses | 141 | 22
Allowance build for credit losses | 117 | (7)
Other changes | 0 | 0
Balance at the end of the period | 1,517 | 1,538
Commercial Banking: | Reserve for unfunded lending commitments |  |
Allowance for Credit Losses [Roll Forward] |  |
Balance at beginning of the period | 143 | 158
Provision for credit losses | 1 | (24)
Balance at the end of the period | 144 | 134
Commercial Banking: | Combined allowance and reserve |  |
Allowance for Credit Losses [Roll Forward] |  |
Balance at the end of the period | $ 1,661 | $ 1,672

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- Definition Financing Receivable, Allowance For Credit Loss, Adjustments, Other + References No definition available. + Details
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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 -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479344/326-20-45-1 + Details
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- Definition Amount, after recovery, of writeoff of financing receivable, charged against allowance for credit loss. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name Regulation S-K (SK) -Number 229 -Section 1405 -Paragraph a -Subparagraph (4) -Publisher SEC Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-13 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 79 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479294/326-20-55-79 + Details
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- Definition Amount of increase (decrease) in allowance for credit loss on financing receivable. + References Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 11B -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481962/310-10-50-11B Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-13 + Details
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- Definition Amount of increase in allowance for credit loss on financing receivable from recovery. + References Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 11B -Subparagraph (c)(4) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481962/310-10-50-11B Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 79 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479294/326-20-55-79 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-13 + Details
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- Definition Amount of writeoff of financing receivable, charged against allowance for credit loss. + References Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 11B -Subparagraph (c)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481962/310-10-50-11B Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 79 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479294/326-20-55-79 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-6 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-13 + Details
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- Definition Amount of credit loss expense (reversal of expense) for financing receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-13 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(11)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478524/942-220-S99-1 + Details
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