Summary of Significant Accounting Policies (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]
Document Period End Date	Dec. 31, 2021
Property, Plant and Equipment, Useful Life	40 years
Other Asset Impairment Charges		$ 5	$ 4
Impairment of Intangible Assets (Excluding Goodwill)	$ 4
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	131	116
Property, Plant and Equipment, Gross	270	260
Depreciation	16	17	18
Goodwill	7	7
Present Value of Future Insurance Profits, Net	0	4
Values Of Business Acquired Distribution Agreements And Customer Relationships	19	25
Accumulated Amortization Of Values Of Business Acquired Distribution Agreements And Customer Relationships	102	96
Amortization Of Values Of Business Acquired Distribution Agreements And Customer Relationships	7	8	8
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
Capitalized Computer Software, Net	145	147
Capitalized Computer Software, Amortization	$ 27	32	$ 31
Value of Customer Relationships Acquired [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	15 years
Value of Distribution Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	15 years
Other Intangible Assets [Member]
Finite-Lived Intangible Assets [Line Items]
Accumulated Amortization Of Values Of Business Acquired Distribution Agreements And Customer Relationships	$ 17	$ 12
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
Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Collateral Obtained Percent Of Fair Value Reverse Repurchase Agreements	100.00%
Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Collateral Obtained Percent Of Fair Value Reverse Repurchase Agreements	105.00%