v3.26.1
Asset Quality - Schedule of Modifications for Borrowers Experiencing Financial Difficulty (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Financing Receivable, Credit Quality Indicator [Line Items]    
Amortized Cost Basis $ 532 $ 516
Amortized Cost Basis (as a percent) 0.48% 0.49%
Interest Rate Reduction    
Financing Receivable, Credit Quality Indicator [Line Items]    
Amortized Cost Basis $ 9 $ 6
Term Extension    
Financing Receivable, Credit Quality Indicator [Line Items]    
Amortized Cost Basis 396 359
Other    
Financing Receivable, Credit Quality Indicator [Line Items]    
Amortized Cost Basis 52 56
Combination    
Financing Receivable, Credit Quality Indicator [Line Items]    
Amortized Cost Basis 75 95
Total commercial loans    
Financing Receivable, Credit Quality Indicator [Line Items]    
Amortized Cost Basis $ 508 $ 480
Amortized Cost Basis (as a percent) 0.62% 0.64%
Total commercial loans | Interest Rate Reduction    
Financing Receivable, Credit Quality Indicator [Line Items]    
Amortized Cost Basis $ 2 $ 0
Total commercial loans | Term Extension    
Financing Receivable, Credit Quality Indicator [Line Items]    
Amortized Cost Basis 393 355
Total commercial loans | Other    
Financing Receivable, Credit Quality Indicator [Line Items]    
Amortized Cost Basis 51 54
Total commercial loans | Combination    
Financing Receivable, Credit Quality Indicator [Line Items]    
Amortized Cost Basis 62 71
Total consumer loans    
Financing Receivable, Credit Quality Indicator [Line Items]    
Amortized Cost Basis $ 24 $ 36
Amortized Cost Basis (as a percent) 0.08% 0.12%
Total consumer loans | Interest Rate Reduction    
Financing Receivable, Credit Quality Indicator [Line Items]    
Amortized Cost Basis $ 7 $ 6
Total consumer loans | Term Extension    
Financing Receivable, Credit Quality Indicator [Line Items]    
Amortized Cost Basis 3 4
Total consumer loans | Other    
Financing Receivable, Credit Quality Indicator [Line Items]    
Amortized Cost Basis 1 2
Total consumer loans | Combination    
Financing Receivable, Credit Quality Indicator [Line Items]    
Amortized Cost Basis 13 24
Commercial and Industrial | Total commercial real estate loans    
Financing Receivable, Credit Quality Indicator [Line Items]    
Amortized Cost Basis $ 388 $ 165
Amortized Cost Basis (as a percent) 0.62% 0.29%
Commercial and Industrial | Total commercial real estate loans | Interest Rate Reduction    
Financing Receivable, Credit Quality Indicator [Line Items]    
Amortized Cost Basis $ 2 $ 0
Commercial and Industrial | Total commercial real estate loans | Term Extension    
Financing Receivable, Credit Quality Indicator [Line Items]    
Amortized Cost Basis 294 109
Commercial and Industrial | Total commercial real estate loans | Other    
Financing Receivable, Credit Quality Indicator [Line Items]    
Amortized Cost Basis 32 37
Commercial and Industrial | Total commercial real estate loans | Combination    
Financing Receivable, Credit Quality Indicator [Line Items]    
Amortized Cost Basis 60 19
Total commercial real estate loans | Total commercial real estate loans    
Financing Receivable, Credit Quality Indicator [Line Items]    
Amortized Cost Basis $ 120 $ 315
Amortized Cost Basis (as a percent) 0.71% 1.89%
Total commercial real estate loans | Total commercial real estate loans | Interest Rate Reduction    
Financing Receivable, Credit Quality Indicator [Line Items]    
Amortized Cost Basis $ 0 $ 0
Total commercial real estate loans | Total commercial real estate loans | Term Extension    
Financing Receivable, Credit Quality Indicator [Line Items]    
Amortized Cost Basis 99 246
Total commercial real estate loans | Total commercial real estate loans | Other    
Financing Receivable, Credit Quality Indicator [Line Items]    
Amortized Cost Basis 19 17
Total commercial real estate loans | Total commercial real estate loans | Combination    
Financing Receivable, Credit Quality Indicator [Line Items]    
Amortized Cost Basis 2 52
Commercial mortgage | Total commercial real estate loans    
Financing Receivable, Credit Quality Indicator [Line Items]    
Amortized Cost Basis $ 120 $ 281
Amortized Cost Basis (as a percent) 0.86% 2.03%
Commercial mortgage | Total commercial real estate loans | Interest Rate Reduction    
Financing Receivable, Credit Quality Indicator [Line Items]    
Amortized Cost Basis $ 0 $ 0
Commercial mortgage | Total commercial real estate loans | Term Extension    
Financing Receivable, Credit Quality Indicator [Line Items]    
Amortized Cost Basis 99 212
Commercial mortgage | Total commercial real estate loans | Other    
Financing Receivable, Credit Quality Indicator [Line Items]    
Amortized Cost Basis 19 17
Commercial mortgage | Total commercial real estate loans | Combination    
Financing Receivable, Credit Quality Indicator [Line Items]    
Amortized Cost Basis 2 52
Construction | Total commercial real estate loans    
Financing Receivable, Credit Quality Indicator [Line Items]    
Amortized Cost Basis   $ 34
Amortized Cost Basis (as a percent)   1.20%
Construction | Total commercial real estate loans | Interest Rate Reduction    
Financing Receivable, Credit Quality Indicator [Line Items]    
Amortized Cost Basis   $ 0
Construction | Total commercial real estate loans | Term Extension    
Financing Receivable, Credit Quality Indicator [Line Items]    
Amortized Cost Basis   34
Construction | Total commercial real estate loans | Other    
Financing Receivable, Credit Quality Indicator [Line Items]    
Amortized Cost Basis   0
Construction | Total commercial real estate loans | Combination    
Financing Receivable, Credit Quality Indicator [Line Items]    
Amortized Cost Basis   0
Real estate — residential mortgage | Total consumer loans    
Financing Receivable, Credit Quality Indicator [Line Items]    
Amortized Cost Basis $ 10 $ 15
Amortized Cost Basis (as a percent) 0.06% 0.08%
Real estate — residential mortgage | Total consumer loans | Interest Rate Reduction    
Financing Receivable, Credit Quality Indicator [Line Items]    
Amortized Cost Basis $ 3 $ 2
Real estate — residential mortgage | Total consumer loans | Term Extension    
Financing Receivable, Credit Quality Indicator [Line Items]    
Amortized Cost Basis 1 0
Real estate — residential mortgage | Total consumer loans | Other    
Financing Receivable, Credit Quality Indicator [Line Items]    
Amortized Cost Basis 0 0
Real estate — residential mortgage | Total consumer loans | Combination    
Financing Receivable, Credit Quality Indicator [Line Items]    
Amortized Cost Basis 6 13
Home equity loans | Total consumer loans    
Financing Receivable, Credit Quality Indicator [Line Items]    
Amortized Cost Basis $ 9 $ 12
Amortized Cost Basis (as a percent) 0.17% 0.18%
Home equity loans | Total consumer loans | Interest Rate Reduction    
Financing Receivable, Credit Quality Indicator [Line Items]    
Amortized Cost Basis $ 4 $ 4
Home equity loans | Total consumer loans | Term Extension    
Financing Receivable, Credit Quality Indicator [Line Items]    
Amortized Cost Basis 1 1
Home equity loans | Total consumer loans | Other    
Financing Receivable, Credit Quality Indicator [Line Items]    
Amortized Cost Basis 1 2
Home equity loans | Total consumer loans | Combination    
Financing Receivable, Credit Quality Indicator [Line Items]    
Amortized Cost Basis 3 5
Other consumer loans | Total consumer loans    
Financing Receivable, Credit Quality Indicator [Line Items]    
Amortized Cost Basis $ 3 $ 5
Amortized Cost Basis (as a percent) 0.07% 0.10%
Other consumer loans | Total consumer loans | Interest Rate Reduction    
Financing Receivable, Credit Quality Indicator [Line Items]    
Amortized Cost Basis $ 0 $ 0
Other consumer loans | Total consumer loans | Term Extension    
Financing Receivable, Credit Quality Indicator [Line Items]    
Amortized Cost Basis 1 3
Other consumer loans | Total consumer loans | Other    
Financing Receivable, Credit Quality Indicator [Line Items]    
Amortized Cost Basis 0 0
Other consumer loans | Total consumer loans | Combination    
Financing Receivable, Credit Quality Indicator [Line Items]    
Amortized Cost Basis 2 2
Credit cards | Total consumer loans    
Financing Receivable, Credit Quality Indicator [Line Items]    
Amortized Cost Basis $ 2 $ 4
Amortized Cost Basis (as a percent) 0.22% 0.43%
Credit cards | Total consumer loans | Interest Rate Reduction    
Financing Receivable, Credit Quality Indicator [Line Items]    
Amortized Cost Basis $ 0 $ 0
Credit cards | Total consumer loans | Term Extension    
Financing Receivable, Credit Quality Indicator [Line Items]    
Amortized Cost Basis 0 0
Credit cards | Total consumer loans | Other    
Financing Receivable, Credit Quality Indicator [Line Items]    
Amortized Cost Basis 0 0
Credit cards | Total consumer loans | Combination    
Financing Receivable, Credit Quality Indicator [Line Items]    
Amortized Cost Basis $ 2 $ 4