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Allowance for Credit Losses - Gross Charge-Offs by Year of Origination (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Allowance for Loan and Lease Losses [Roll Forward] |  |
Year one, current fiscal year charge offs | $ 2 | $ 0
Year two, current fiscal year charge offs | 0 | 5
Year three, current fiscal year charge offs | 7 | 0
Year four, current fiscal year charge offs | 13 | 1
Year five, current fiscal year charge offs | 1 | 2
Prior year charge offs | 19 | 10
Revolving loans charge offs | 4 | 4
Total charge offs | 46 | 22
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 | 5
Year three, current fiscal year charge offs | 7 | 0
Year four, current fiscal year charge offs | 13 | 1
Year five, current fiscal year charge offs | 1 | 0
Prior year charge offs | 6 | 6
Revolving loans charge offs | 1 | 2
Total charge offs | 28 | 14
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 | 2
Prior year charge offs | 12 | 0
Revolving loans charge offs | 0 | 0
Total charge offs | 12 | 2
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 | 1
Revolving loans charge offs | 0 | 0
Total charge offs | 0 | 1
Consumer: | Credit Card and Other |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |
Year one, current fiscal year charge offs | 2 | 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 | 1 | 3
Revolving loans charge offs | 3 | 2
Total charge offs | $ 6 | $ 5

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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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