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Shareholders' Equity - Comprehensive Capital Plan (Details) - USD ($)	3 Months Ended				12 Months Ended
	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Jul. 31, 2021
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Common shares repurchased, value					$ 38,000,000	$ 0	$ 559,000,000
Cash dividends declared on Common Shares (in dollars per share)	$ 0.205	$ 0.205	$ 0.205	$ 0.205	$ 0.82	$ 0.79	$ 0.75
2021 Repurchase Authorization
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Authorized amount of share repurchases								$ 1,500,000,000
Open Market Share Repurchases
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Common shares repurchased, value					$ 38,000,000
Equity Compensation Programs
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Common shares repurchased, value					$ 34,000,000

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Aggregate dividends declared during the period for each share of common stock outstanding.

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Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method.

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