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Long-Term Borrowings - Summary of Long-Term Borrowings (Detail) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Debt Disclosure [Abstract]    
Federal Home Loan Bank advances $ 0 $ 400
Senior notes 299 299
Subordinated notes 68 81
Junior subordinated debt 67 66
Other subordinated debt 248 249
Total long-term borrowings $ 682 $ 1,095