Shareholders' Equity - Comprehensive Capital Plan (Details) - USD ($) $ / shares in Units, $ in Billions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Jul. 31, 2021
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Cash dividends declared on Common Shares (in usd per share)	$ 0.195	$ 0.185
Employee Equity Compensation Programs
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Stock repurchase program, amount authorized			$ 1.5
2021 Capital Plan
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Cash dividends declared on Common Shares (in usd per share)	$ 0.195