v3.26.1
Segments - Operating Segment Information (Detail)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
USD ($)
Jun. 30, 2025
USD ($)
Jun. 30, 2026
USD ($)
Segment
Jun. 30, 2025
USD ($)
Mar. 31, 2026
USD ($)
Dec. 31, 2025
USD ($)
Mar. 31, 2025
USD ($)
Dec. 31, 2024
USD ($)
Operating Statistics [Line Items]                
Reportable segments | Segment     3          
Goodwill weighting assigned     100.00%          
Cash, cash equivalents, and investment securities $ 26,558.0   $ 26,558.0     $ 24,034.0    
Loans HFS 4,347.0   4,347.0     3,498.0    
Loans HFI, net of deferred fees and costs 60,949.0   60,949.0     58,677.0    
Less: allowance for credit losses (487.4) $ (394.7) (487.4) $ (394.7) $ (461.1) (460.6) $ (388.6) $ (373.8)
Net loans HFI 60,462.0   60,462.0     58,216.0    
Goodwill and intangible assets, net 644.0   644.0     649.0    
Other assets 6,690.0   6,690.0     6,377.0    
Total assets 98,701.0   98,701.0     92,774.0    
Total deposits 81,874.0   81,874.0     77,159.0    
Borrowings and qualifying debt 7,305.0   7,305.0     6,316.0    
Other liabilities 1,387.0   1,387.0     1,353.0    
Total liabilities 90,566.0   90,566.0     84,828.0    
Total equity 8,135.3 7,406.8 8,135.3 7,406.8 $ 7,908.1 7,945.9 $ 7,214.5 $ 6,707.5
Total liabilities and equity 98,701.0   98,701.0     92,774.0    
Excess funds (used) provided 0.0   0.0     0.0    
Interest income 1,231.9 1,154.4 2,420.1 2,250.0        
Interest expense 435.0 456.8 856.9 901.8        
Funds transfer pricing 0.0 0.0 0.0 0.0        
Net interest income 796.9 697.6 1,563.2 1,348.2        
Provision for (recovery of) credit losses 80.4 39.9 293.6 71.1        
Net interest income (expense) after provision for credit losses 716.5 657.7 1,269.6 1,277.1        
Non-interest income 198.8 148.3 451.4 275.7        
Salaries and employee benefits 204.3 179.9 409.8 362.3        
Other non-interest expense 379.0 334.8 747.9 652.8        
Income (loss) before provision for income taxes 332.0 291.3 563.3 537.7        
Income tax expense (benefit) 63.2 53.5 105.3 100.8        
Net income 268.8 237.8 $ 458.0 436.9        
Minimum                
Operating Statistics [Line Items]                
Equity capital weighting assigned     0.00%          
Maximum                
Operating Statistics [Line Items]                
Equity capital weighting assigned     25.00%          
Operating Segments | Commercial Segment                
Operating Statistics [Line Items]                
Cash, cash equivalents, and investment securities 14.0   $ 14.0     16.0    
Loans HFS 62.0   62.0     67.0    
Loans HFI, net of deferred fees and costs 36,153.0   36,153.0     34,784.0    
Less: allowance for credit losses (413.0)   (413.0)     (390.0)    
Net loans HFI 35,740.0   35,740.0     34,394.0    
Goodwill and intangible assets, net 290.0   290.0     290.0    
Other assets 378.0   378.0     352.0    
Total assets 36,484.0   36,484.0     35,119.0    
Total deposits 31,220.0   31,220.0     30,806.0    
Borrowings and qualifying debt 0.0   0.0     0.0    
Other liabilities 108.0   108.0     91.0    
Total liabilities 31,328.0   31,328.0     30,897.0    
Total equity 3,584.0   3,584.0     3,400.0    
Total liabilities and equity 34,912.0   34,912.0     34,297.0    
Excess funds (used) provided (1,572.0)   (1,572.0)     (822.0)    
Interest income 608.6 612.9 1,207.0 1,204.4        
Interest expense 165.1 153.5 323.4 303.4        
Funds transfer pricing (62.0) (138.3) (131.6) (270.1)        
Net interest income 381.5 321.1 752.0 630.9        
Provision for (recovery of) credit losses 82.7 35.0 288.9 66.2        
Net interest income (expense) after provision for credit losses 298.8 286.1 463.1 564.7        
Non-interest income 56.9 38.3 104.7 75.2        
Salaries and employee benefits 43.8 35.4 87.8 79.6        
Other non-interest expense 139.3 134.4 278.1 259.2        
Income (loss) before provision for income taxes 172.6 154.6 201.9 301.1        
Income tax expense (benefit) 32.8 28.1 37.8 50.5        
Net income 139.8 126.5 164.1 250.6        
Operating Segments | Consumer Related Segment                
Operating Statistics [Line Items]                
Cash, cash equivalents, and investment securities 0.0   0.0     0.0    
Loans HFS 4,285.0   4,285.0     3,431.0    
Loans HFI, net of deferred fees and costs 24,796.0   24,796.0     23,893.0    
Less: allowance for credit losses (74.0)   (74.0)     (71.0)    
Net loans HFI 24,722.0   24,722.0     23,822.0    
Goodwill and intangible assets, net 354.0   354.0     359.0    
Other assets 2,483.0   2,483.0     2,237.0    
Total assets 31,844.0   31,844.0     29,849.0    
Total deposits 44,619.0   44,619.0     40,466.0    
Borrowings and qualifying debt 57.0   57.0     48.0    
Other liabilities 500.0   500.0     336.0    
Total liabilities 45,176.0   45,176.0     40,850.0    
Total equity 2,637.0   2,637.0     2,570.0    
Total liabilities and equity 47,813.0   47,813.0     43,420.0    
Excess funds (used) provided 15,969.0   15,969.0     13,571.0    
Interest income 342.3 303.3 672.3 588.5        
Interest expense 151.7 156.9 302.5 312.9        
Funds transfer pricing 343.0 286.0 648.3 556.2        
Net interest income 533.6 432.4 1,018.1 831.8        
Provision for (recovery of) credit losses (2.7) 4.8 3.8 9.9        
Net interest income (expense) after provision for credit losses 536.3 427.6 1,014.3 821.9        
Non-interest income 109.6 86.0 228.1 165.5        
Salaries and employee benefits 52.9 39.1 103.7 82.1        
Other non-interest expense 338.7 291.2 660.6 557.9        
Income (loss) before provision for income taxes 254.3 183.3 478.1 347.4        
Income tax expense (benefit) 48.8 34.3 88.3 59.5        
Net income 205.5 149.0 389.8 287.9        
Corporate & Other | Corporate And Other Segment                
Operating Statistics [Line Items]                
Cash, cash equivalents, and investment securities 26,544.0   26,544.0     24,018.0    
Loans HFS 0.0   0.0     0.0    
Loans HFI, net of deferred fees and costs 0.0   0.0     0.0    
Less: allowance for credit losses 0.0   0.0     0.0    
Net loans HFI 0.0   0.0     0.0    
Goodwill and intangible assets, net 0.0   0.0     0.0    
Other assets 3,829.0   3,829.0     3,788.0    
Total assets 30,373.0   30,373.0     27,806.0    
Total deposits 6,035.0   6,035.0     5,887.0    
Borrowings and qualifying debt 7,248.0   7,248.0     6,268.0    
Other liabilities 779.0   779.0     926.0    
Total liabilities 14,062.0   14,062.0     13,081.0    
Total equity 1,914.0   1,914.0     1,976.0    
Total liabilities and equity 15,976.0   15,976.0     15,057.0    
Excess funds (used) provided (14,397.0)   (14,397.0)     $ (12,749.0)    
Interest income 281.0 238.2 540.8 457.1        
Interest expense 118.2 146.4 231.0 285.5        
Funds transfer pricing (281.0) (147.7) (516.7) (286.1)        
Net interest income (118.2) (55.9) (206.9) (114.5)        
Provision for (recovery of) credit losses 0.4 0.1 0.9 (5.0)        
Net interest income (expense) after provision for credit losses (118.6) (56.0) (207.8) (109.5)        
Non-interest income 32.3 24.0 118.6 35.0        
Salaries and employee benefits 107.6 105.4 218.3 200.6        
Other non-interest expense (99.0) (90.8) (190.8) (164.3)        
Income (loss) before provision for income taxes (94.9) (46.6) (116.7) (110.8)        
Income tax expense (benefit) (18.4) (8.9) (20.8) (9.2)        
Net income $ (76.5) $ (37.7) $ (95.9) $ (101.6)