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Summary of Significant Accounting Policies (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items] |  |  |
Property, Plant and Equipment, Useful Life | 40 years |  |
Other Asset Impairment Charges |  | $ 5 |
Impairment of Intangible Assets (Excluding Goodwill) | $ 4 |  |
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment | 136 | 131 |
Property, Plant and Equipment, Gross | 270 |  |
Depreciation | 15 | 16 | $ 17
Goodwill | 7 | 7 |
Values Of Business Acquired Distribution Agreements And Customer Relationships | 12 | 19 |
Accumulated Amortization Of Values Of Business Acquired Distribution Agreements And Customer Relationships | 109 | 102 |
Amortization Of Values Of Business Acquired Distribution Agreements And Customer Relationships | 6 | 7 | 8
Finite-Lived Intangible Assets, Amortization Expense, Year Two | 6 |  |
Finite-Lived Intangible Assets, Amortization Expense, Year Three | 6 |  |
Capitalized Computer Software, Net | 138 | 145 |
Capitalized Computer Software, Amortization | $ 24 | 27 | $ 32
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 | $ 20 | $ 17 |
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months | 3 |  |
Finite-Lived Intangible Assets, Amortization Expense, Year Two | 3 |  |
Finite-Lived Intangible Assets, Amortization Expense, Year Three | 3 |  |
Finite-Lived Intangible Assets, Amortization Expense, Year Four | $ 3 |  |

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