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Allowance for Credit Losses - Gross Charge-Offs by Year of Origination (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2025 | Mar. 31, 2024
Allowance for Loan and Lease Losses [Roll Forward] |  |
Year one, current fiscal year charge offs | $ 2 | $ 2
Year two, current fiscal year charge offs | 0 | 0
Year three, current fiscal year charge offs | 0 | 7
Year four, current fiscal year charge offs | 5 | 13
Year five, current fiscal year charge offs | 16 | 1
Prior year charge offs | 15 | 19
Revolving loans charge offs | 3 | 4
Total charge offs | 41 | 46
Commercial: | Commercial, financial, and industrial |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |
Year one, current fiscal year charge offs | 0 | 0
Year two, current fiscal year charge offs | 0 | 0
Year three, current fiscal year charge offs | 0 | 7
Year four, current fiscal year charge offs | 5 | 13
Year five, current fiscal year charge offs | 16 | 1
Prior year charge offs | 12 | 6
Revolving loans charge offs | 1 | 1
Total charge offs | 34 | 28
Commercial: | Commercial Real Estate |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |
Year one, current fiscal year charge offs | 0 | 0
Year two, current fiscal year charge offs | 0 | 0
Year three, current fiscal year charge offs | 0 | 0
Year four, current fiscal year charge offs | 0 | 0
Year five, current fiscal year charge offs | 0 | 0
Prior year charge offs | 3 | 12
Revolving loans charge offs | 0 | 0
Total charge offs | 3 | 12
Consumer: | Consumer Real Estate |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |
Year one, current fiscal year charge offs | 0 | 0
Year two, current fiscal year charge offs | 0 | 0
Year three, current fiscal year charge offs | 0 | 0
Year four, current fiscal year charge offs | 0 | 0
Year five, current fiscal year charge offs | 0 | 0
Prior year charge offs | 0 | 0
Revolving loans charge offs | 0 | 0
Total charge offs | 0 | 0
Consumer: | Credit Card and Other |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |
Year one, current fiscal year charge offs | 2 | 2
Year two, current fiscal year charge offs | 0 | 0
Year three, current fiscal year charge offs | 0 | 0
Year four, current fiscal year charge offs | 0 | 0
Year five, current fiscal year charge offs | 0 | 0
Prior year charge offs | 0 | 1
Revolving loans charge offs | 2 | 3
Total charge offs | $ 4 | $ 6

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- Definition Amount, excluding accrued interest, of decrease in allowance for credit loss on financing receivable from writeoff. Excludes net investment in lease. + References Reference 1: 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 2: 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, excluding accrued interest, of writeoff of financing receivable originated more than five years before current fiscal year. Excludes net investment in lease. + References Reference 1: 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 + Details
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- Definition Amount, excluding accrued interest, of writeoff of revolving financing receivable converted to term loan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6A -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-6A + Details
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- Definition Amount, excluding accrued interest, of writeoff of financing receivable originated four years before current fiscal year. Excludes net investment in lease. + References Reference 1: 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 + Details
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