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Shareholders' Equity (Narrative) (Details) - USD ($) shares in Millions, $ in Billions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Jun. 01, 2018
Shareholders' Equity Disclosure [Line Items] |  |  |
Cash Dividends Paid to Parent, Consolidated Subsidiaries | $ 8.0 | $ 8.3 |
Statutory Accounting Practices, Statutory Capital and Surplus, Balance | 30.7 |  |
Statutory Accounting Practices, Statutory Capital and Surplus Required | 13.0 |  |
Stock Repurchase Program, Number of Shares Authorized to be Repurchased |  |  | 100
Extraordinary Dividends [Member] |  |  |
Shareholders' Equity Disclosure [Line Items] |  |  |
Cash Dividends Paid to Parent, Consolidated Subsidiaries | $ 4.7 | $ 4.2 |

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- Definition [Line Items] for Share Repurchases [Table] + References No definition available. + Details
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- Definition This element represents disclosure of the aggregate cash dividends paid to the entity by consolidated subsidiaries. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-04(b)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e24072-122690 + Details
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- Definition The amount of statutory capital and surplus (stockholders' equity) as of the balance sheet date using prescribed or permitted statutory accounting practices (rather than GAAP, if different) of the state or country. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(23)(c)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6486098&loc=d3e24708-158529 + Details
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- Definition Amount of statutory capital required to be maintained as of the balance sheet date under prescribed or permitted statutory accounting practices. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6486098&loc=d3e24708-158529 + Details
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- Definition The number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan. + References No definition available. + Details
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