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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% |  |

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