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Borrowings - Schedule of Borrowings (Details) - USD ($)
$ in Millions
Mar. 31, 2024
Dec. 31, 2023
Short-term borrowings    
Federal funds purchased and repurchased agreements $ 295 $ 316
FHLB advances 4,500 5,000
Total short-term borrowings 4,795 5,316
Long-term borrowings    
Senior notes 3,743 3,741
FHLB Advances 2,005 5
Subordinated notes 866 873
Asset-backed notes 934 474
Other 10 10
Total long-term borrowings 11,450 8,201
M&T [Member]    
Long-term borrowings    
Senior notes 3,276 2,482
Subordinated notes 75 76
Junior subordinated debentures $ 541 $ 540