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Debt (Senior Note Offering) (Narrative) (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2022 | Jun. 30, 2006
Debt Instrument [Line Items] |  |
Debt Instrument, Face Amount |  | $ 850,000,000
Proceeds from Debt, Net of Issuance Costs | $ 690,000,000 |
Debt Related Commitment Fees and Debt Issuance Costs | $ 10,000,000 |
Senior Notes Due 2029 [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Interest Rate, Stated Percentage | 3.90% |
Debt Instrument, Face Amount | $ 600,000,000 |
Subordinated Debentures Due 2052 |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Offering Date | Sep. 23, 2022 |
Debt Instrument, Interest Rate, Stated Percentage | 7.125% |
Debt Instrument, Face Amount | $ 700,000,000 |

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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1B -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=123466505&loc=SL123495323-112611 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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