v3.26.3
Goodwill and Other Intangible Assets (Narrative) (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2026
Mar. 31, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Dec. 31, 2025
Aug. 31, 2025
Intangible Asset, Finite-Lived [Line Items]              
Goodwill $ 1,482,000,000     $ 1,482,000,000   $ 1,482,000,000  
Intangible Asset, Finite-Lived, Useful Life 10 years     10 years      
Intangible Asset, Including Goodwill, Impairment Loss   $ 0   $ 0      
Intangible amortization $ 38,000,000   $ 31,000,000 $ 117,000,000 $ 85,000,000    
Columbia Banking Systems and Pacific Premier Bancorp Merger              
Intangible Asset, Finite-Lived [Line Items]              
Goodwill             $ 453,000,000