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Debt (Schedule of Long-term Debt Instruments) (Details) - USD ($) | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Debt Instrument [Line Items] |  |
Long-term Debt, Gross | $ 4,464,000,000 | $ 3,993,000,000
Debt Issuance Cost | 37,000,000 | 32,000,000
Long-term debt | 4,427,000,000 | 3,961,000,000
Senior Notes Due 2023 [Member] |  |
Debt Instrument [Line Items] |  |
Long-term Debt, Gross | 0 | 400,000,000
Debt Instrument, Face Amount | $ 400,000,000 |
Debt Instrument, Interest Rate, Stated Percentage | 4.70% |
Senior Notes Due 2026 [Member] |  |
Debt Instrument [Line Items] |  |
Long-term Debt, Gross | $ 400,000,000 | 400,000,000
Debt Instrument, Face Amount | $ 400,000,000 |
Debt Instrument, Interest Rate, Stated Percentage | 3.95% |
Senior Notes Due 2029 [Member] |  |
Debt Instrument [Line Items] |  |
Long-term Debt, Gross | $ 599,000,000 | 599,000,000
Debt Instrument, Face Amount | $ 600,000,000 |
Debt Instrument, Interest Rate, Stated Percentage | 3.90% |
Subordinated Debentures Due 2042 [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Interest Rate, Stated Percentage | 6.20% |
Subordinated Debentures Due 2056 [Member] |  |
Debt Instrument [Line Items] |  |
Long-term Debt, Gross | $ 400,000,000 | 400,000,000
Debt Instrument, Face Amount | $ 400,000,000 |
Debt Instrument, Interest Rate, Stated Percentage | 5.75% |
Junior Subordinated Debentures Due 2065 [Member] |  |
Debt Instrument [Line Items] |  |
Long-term Debt, Gross | $ 319,000,000 | 319,000,000
Debt Instrument, Face Amount | $ 400,000,000 |
Debt Instrument, Interest Rate, Stated Percentage | 4.82% |
Notes Payable to Banks [Member] |  |
Debt Instrument [Line Items] |  |
Long-term Debt, Gross | $ 74,000,000 | 77,000,000
Debt Instrument, Face Amount | $ 100,000,000 |
Debt Instrument, Interest Rate, Stated Percentage | 4.09% |
Senior Notes Due 2030 |  |
Debt Instrument [Line Items] |  |
Long-term Debt, Gross | $ 598,000,000 | 598,000,000
Debt Instrument, Face Amount | $ 600,000,000 |
Debt Instrument, Interest Rate, Stated Percentage | 3.15% |
Surplus Note Due 2051 |  |
Debt Instrument [Line Items] |  |
Long-term Debt, Gross | $ 500,000,000 | 500,000,000
Debt Instrument, Face Amount | $ 500,000,000 |
Debt Instrument, Interest Rate, Stated Percentage | 4.00% |
Subordinated Debentures Due 2052 |  |
Debt Instrument [Line Items] |  |
Long-term Debt, Gross | $ 700,000,000 | 700,000,000
Debt Instrument, Face Amount | $ 700,000,000 |
Debt Instrument, Interest Rate, Stated Percentage | 7.125% |
Senior Notes Due 2033 |  |
Debt Instrument [Line Items] |  |
Long-term Debt, Gross | $ 399,000,000 | 0
Debt Instrument, Face Amount | $ 400,000,000 |
Debt Instrument, Interest Rate, Stated Percentage | 6.00% |
Surplus Note Due 2043 |  |
Debt Instrument [Line Items] |  |
Long-term Debt, Gross | $ 475,000,000 | $ 0
Debt Instrument, Face Amount | $ 500,000,000 |
Debt Instrument, Interest Rate, Stated Percentage | 7.125% |

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