Summary of Significant Accounting Policies Summary of Significant Accounting Policies (Intangible Assets) (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Acquired Finite-Lived Intangible Assets [Line Items]
Accumulated Amortization Of Values Of Business Acquired Distribution Agreements And Customer Relationships	$ 102	$ 96
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months	6
Finite-Lived Intangible Assets, Amortization Expense, Year Two	6
Finite-Lived Intangible Assets, Amortization Expense, Year Three	6
Present Value of Future Insurance Profits, Net	0	4
Other Intangible Assets [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired	22	30
Accumulated Amortization Of Values Of Business Acquired Distribution Agreements And Customer Relationships	17	12
Amortization of Intangible Assets	4	$ 4	$ 4
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months	4
Finite-Lived Intangible Assets, Amortization Expense, Year Two	4
Finite-Lived Intangible Assets, Amortization Expense, Year Three	4
Finite-Lived Intangible Assets, Amortization Expense, Year Four	4
Finite-Lived Intangible Assets, Amortization Expense, Year Five	$ 3