v3.26.1
Asset Quality - Schedule of Modifications for Borrowers Experiencing Financial Difficulty (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Financing Receivable, Credit Quality Indicator [Line Items]    
Amortized Cost Basis $ 582 $ 638
Amortized Cost Basis (as a percent) 0.53% 0.61%
Interest Rate Reduction    
Financing Receivable, Credit Quality Indicator [Line Items]    
Amortized Cost Basis $ 7 $ 5
Term Extension    
Financing Receivable, Credit Quality Indicator [Line Items]    
Amortized Cost Basis 415 509
Other    
Financing Receivable, Credit Quality Indicator [Line Items]    
Amortized Cost Basis 46 82
Combination    
Financing Receivable, Credit Quality Indicator [Line Items]    
Amortized Cost Basis 114 42
Total commercial loans    
Financing Receivable, Credit Quality Indicator [Line Items]    
Amortized Cost Basis $ 558 $ 603
Amortized Cost Basis (as a percent) 0.70% 0.82%
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 411 505
Total commercial loans | Other    
Financing Receivable, Credit Quality Indicator [Line Items]    
Amortized Cost Basis 45 81
Total commercial loans | Combination    
Financing Receivable, Credit Quality Indicator [Line Items]    
Amortized Cost Basis 100 17
Total consumer loans    
Financing Receivable, Credit Quality Indicator [Line Items]    
Amortized Cost Basis $ 24 $ 35
Amortized Cost Basis (as a percent) 0.08% 0.11%
Total consumer loans | Interest Rate Reduction    
Financing Receivable, Credit Quality Indicator [Line Items]    
Amortized Cost Basis $ 5 $ 5
Total consumer loans | Term Extension    
Financing Receivable, Credit Quality Indicator [Line Items]    
Amortized Cost Basis 4 4
Total consumer loans | Other    
Financing Receivable, Credit Quality Indicator [Line Items]    
Amortized Cost Basis 1 1
Total consumer loans | Combination    
Financing Receivable, Credit Quality Indicator [Line Items]    
Amortized Cost Basis 14 25
Commercial and Industrial | Total commercial real estate loans    
Financing Receivable, Credit Quality Indicator [Line Items]    
Amortized Cost Basis $ 347 $ 227
Amortized Cost Basis (as a percent) 0.57% 0.42%
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 271 150
Commercial and Industrial | Total commercial real estate loans | Other    
Financing Receivable, Credit Quality Indicator [Line Items]    
Amortized Cost Basis 27 60
Commercial and Industrial | Total commercial real estate loans | Combination    
Financing Receivable, Credit Quality Indicator [Line Items]    
Amortized Cost Basis 47 17
Total commercial real estate loans | Total commercial real estate loans    
Financing Receivable, Credit Quality Indicator [Line Items]    
Amortized Cost Basis $ 211 $ 376
Amortized Cost Basis (as a percent) 1.25% 2.33%
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 140 355
Total commercial real estate loans | Total commercial real estate loans | Other    
Financing Receivable, Credit Quality Indicator [Line Items]    
Amortized Cost Basis 18 21
Total commercial real estate loans | Total commercial real estate loans | Combination    
Financing Receivable, Credit Quality Indicator [Line Items]    
Amortized Cost Basis 53 0
Commercial mortgage | Total commercial real estate loans    
Financing Receivable, Credit Quality Indicator [Line Items]    
Amortized Cost Basis $ 211 $ 327
Amortized Cost Basis (as a percent) 1.49% 2.47%
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 140 306
Commercial mortgage | Total commercial real estate loans | Other    
Financing Receivable, Credit Quality Indicator [Line Items]    
Amortized Cost Basis 18 21
Commercial mortgage | Total commercial real estate loans | Combination    
Financing Receivable, Credit Quality Indicator [Line Items]    
Amortized Cost Basis 53 0
Construction | Total commercial real estate loans    
Financing Receivable, Credit Quality Indicator [Line Items]    
Amortized Cost Basis   $ 49
Amortized Cost Basis (as a percent)   1.67%
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   49
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 $ 9 $ 14
Amortized Cost Basis (as a percent) 0.05% 0.07%
Real estate — residential mortgage | Total consumer loans | Interest Rate Reduction    
Financing Receivable, Credit Quality Indicator [Line Items]    
Amortized Cost Basis $ 2 $ 1
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 $ 8 $ 12
Amortized Cost Basis (as a percent) 0.14% 0.19%
Home equity loans | Total consumer loans | Interest Rate Reduction    
Financing Receivable, Credit Quality Indicator [Line Items]    
Amortized Cost Basis $ 3 $ 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 1
Home equity loans | Total consumer loans | Combination    
Financing Receivable, Credit Quality Indicator [Line Items]    
Amortized Cost Basis 3 6
Other consumer loans | Total consumer loans    
Financing Receivable, Credit Quality Indicator [Line Items]    
Amortized Cost Basis $ 4 $ 5
Amortized Cost Basis (as a percent) 0.09% 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 2 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 $ 3 $ 4
Amortized Cost Basis (as a percent) 0.33% 0.44%
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 $ 3 $ 4