Shareholders' Equity - Narrative (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Jul. 31, 2021
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Amount repurchased during period (less than)	$ 0		$ 38,000,000
Cash dividends declared on Common Shares (in usd per share)	$ 0.205	$ 0.195	$ 0.410	$ 0.585
Employee Equity Compensation Programs
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Stock repurchase program, amount authorized (up to)					$ 1,500,000,000
Remaining authorized amount	$ 752,000,000		$ 752,000,000
Equity Compensation Programs
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Amount repurchased during period (less than)	$ 1,000,000
2021 Capital Plan
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Cash dividends declared on Common Shares (in usd per share)	$ 0.205