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Accumulated Other Comprehensive (Loss) Income - Schedule of Pretax and After-tax Components of Other Comprehensive Income (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Accumulated Other Comprehensive Income (Loss) [Line Items]    
AOCI activity before reclassification, net amount $ 53.0 $ (318.0)
Amounts reclassified from AOCI 13.0 3.0
Gross Unrealized 88.0 (415.0)
Income Taxes (22.0) 100.0
Other comprehensive income (loss), net of tax 66.0 (315.0)
Net realized losses on sales of investment securities available for sale 14.0 0.0
Investment securities available for sale, allowance for credit loss 4.0  
Defined benefit pension items    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
AOCI activity before reclassification, gross amount 10.0 0.0
AOCI activity before reclassification, tax (2.0) 0.0
AOCI activity before reclassification, net amount 8.0 0.0
Amounts reclassified from AOCI 0.0 2.0
Gross Unrealized 10.0 3.0
Income Taxes (2.0) (1.0)
Other comprehensive income (loss), net of tax 8.0 2.0
Defined benefit pension items | Other noninterest expense    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Reclassification out of AOCI, gross amount 0.0 3.0
Reclassification out of AOCI, tax 0.0 (1.0)
Amounts reclassified from AOCI 0.0 2.0
Unrealized loss on securities available for sale    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
AOCI activity before reclassification, gross amount 60.0 (419.0)
AOCI activity before reclassification, tax (15.0) 101.0
AOCI activity before reclassification, net amount 45.0 (318.0)
Gross Unrealized 78.0 (419.0)
Income Taxes (20.0) 101.0
Other comprehensive income (loss), net of tax 58.0 (318.0)
Unrealized loss on securities available for sale | $14 realized loss on sales of investment securities available for sale, net; $4 provision for credit losses    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Reclassification out of AOCI, gross amount 18.0 0.0
Reclassification out of AOCI, tax (5.0) 0.0
Amounts reclassified from AOCI 13.0 0.0
Unrealized loss on securities available for sale transferred to securities held to maturity    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
AOCI activity before reclassification, gross amount 0.0 0.0
AOCI activity before reclassification, tax 0.0 0.0
AOCI activity before reclassification, net amount 0.0 0.0
Amounts reclassified from AOCI 0.0 1.0
Gross Unrealized 0.0 1.0
Income Taxes 0.0 0.0
Other comprehensive income (loss), net of tax 0.0 1.0
Unrealized loss on securities available for sale transferred to securities held to maturity | Interest on investment securities    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Reclassification out of AOCI, gross amount 0.0 1.0
Reclassification out of AOCI, tax 0.0 0.0
Amounts reclassified from AOCI 0.0 1.0
Unrealized (loss) gain on securities available for sale    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
AOCI activity before reclassification, net amount 45.0 (318.0)
Amounts reclassified from AOCI 13.0 0.0
Other comprehensive income (loss), net of tax $ 58.0 $ (318.0)