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Summary of Significant Accounting Policies Summary of Significant Accounting Policies (Intangible Assets) (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended
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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 |  |

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- Definition The amount representing the accumulated charge against earnings to reduce the business acquired distribution agreements and customer relationships (VODA and VOCRA). + References No definition available. + Details
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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 + Details
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