Basis of Presentation and Accounting Policies (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2022	Feb. 27, 2022	Dec. 31, 2021
Business Acquisition [Line Items]
Common stock, par value (in dollars per share)	$ 0.625		$ 0.625
TD Merger Agreement
Business Acquisition [Line Items]
Common stock, par value (in dollars per share)		$ 0.625
Cash to be received per common share upon closing (in dollars per share)		25.00
Additional cash to be received per common share upon closing, annual basis (in dollars per share)		0.65
Additional cash to be received per common share upon closing, monthly basis (in dollars per share)		$ 0.054
Merger and integration expense	$ 9