Acquisition and Divestitures - Summary of Unpaid Principal Balance to Fair Value of PCD Loans and Leases by Portfolio Segment (Parenthetical) (Details) - USD ($) $ in Millions		12 Months Ended
	Apr. 01, 2022	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]
Charge-offs		$ (570)	$ (303)	$ (338)
PCD Acquired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Charge-offs	$ (33)
Non PCD Acquired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Charge-offs	$ (242)