Shareholders' Equity (Narrative) (Details) - USD ($) shares in Millions, $ in Billions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Jun. 01, 2018
Shareholders' Equity Disclosure [Line Items]
Cash Dividends Paid to Parent, Consolidated Subsidiaries	$ 8.0	$ 8.3
Statutory Accounting Practices, Statutory Capital and Surplus, Balance	30.7
Statutory Accounting Practices, Statutory Capital and Surplus Required	13.0
Stock Repurchase Program, Number of Shares Authorized to be Repurchased			100
Extraordinary Dividends [Member]
Shareholders' Equity Disclosure [Line Items]
Cash Dividends Paid to Parent, Consolidated Subsidiaries	$ 4.7	$ 4.2