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Allowance for Credit Losses - Gross Charge-Offs by Year of Origination (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |
Year one, current fiscal year charge offs |  |  | $ 7 | $ 6
Year two, current fiscal year charge offs |  |  | 3 | 15
Year three, current fiscal year charge offs |  |  | 7 | 15
Year four, current fiscal year charge offs |  |  | 24 | 23
Year five, current fiscal year charge offs |  |  | 30 | 17
Prior year charge offs |  |  | 38 | 43
Revolving loans charge offs |  |  | 10 | 9
Total charge offs | $ 35 | $ 33 | 119 | 128
Commercial: | Commercial, financial, and industrial |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |
Year one, current fiscal year charge offs |  |  | 2 | 0
Year two, current fiscal year charge offs |  |  | 3 | 13
Year three, current fiscal year charge offs |  |  | 5 | 13
Year four, current fiscal year charge offs |  |  | 13 | 23
Year five, current fiscal year charge offs |  |  | 28 | 1
Prior year charge offs |  |  | 31 | 11
Revolving loans charge offs |  |  | 4 | 3
Total charge offs | 25 | 12 | 86 | 64
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 | 1
Year four, current fiscal year charge offs |  |  | 9 | 0
Year five, current fiscal year charge offs |  |  | 0 | 16
Prior year charge offs |  |  | 5 | 30
Revolving loans charge offs |  |  | 0 | 0
Total charge offs | 3 | 15 | 14 | 47
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 | 1
Year three, current fiscal year charge offs |  |  | 1 | 0
Year four, current fiscal year charge offs |  |  | 1 | 0
Year five, current fiscal year charge offs |  |  | 0 | 0
Prior year charge offs |  |  | 1 | 1
Revolving loans charge offs |  |  | 0 | 0
Total charge offs | 1 | 1 | 3 | 2
Consumer: | Credit Card and Other |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |
Year one, current fiscal year charge offs |  |  | 5 | 6
Year two, current fiscal year charge offs |  |  | 0 | 1
Year three, current fiscal year charge offs |  |  | 1 | 1
Year four, current fiscal year charge offs |  |  | 1 | 0
Year five, current fiscal year charge offs |  |  | 2 | 0
Prior year charge offs |  |  | 1 | 1
Revolving loans charge offs |  |  | 6 | 6
Total charge offs | $ 6 | $ 5 | $ 16 | $ 15

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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 13 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-13 Reference 2: 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 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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