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Goodwill and Other Intangible Assets - Summary of Goodwill by Reportable Segment (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2023
Dec. 31, 2022
Goodwill [Roll Forward]    
Goodwill, beginning balance $ 1,511 $ 1,511
Additions 0 0
Goodwill, ending balance 1,511 1,511
Regional Banking    
Goodwill [Roll Forward]    
Goodwill, beginning balance 880 880
Additions 0 0
Goodwill, ending balance 880 880
Specialty Banking    
Goodwill [Roll Forward]    
Goodwill, beginning balance 631 631
Additions 0 0
Goodwill, ending balance $ 631 $ 631