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Debt (Schedule of Long-term Debt Instruments) (Details) - USD ($) | Dec. 31, 2021 | Dec. 31, 2020 | Jun. 30, 2006
--- | --- | --- | ---
Debt Instrument [Line Items] |  |  |
Long-term Debt, Gross | $ 3,695,000,000 | $ 3,597,000,000 |
Debt Issuance Cost | 28,000,000 | 24,000,000 |
Debt Instrument, Face Amount |  |  | $ 850,000,000
Long-term debt | 3,667,000,000 | 3,573,000,000 |
Senior Notes Due 2021 [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 | 5.00% |  |
Senior Notes Due 2023 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Debt, Gross | $ 400,000,000 | 399,000,000 |
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] |  |  |
Long-term Debt, Gross | $ 400,000,000 | 400,000,000 |
Debt Instrument, Face Amount | $ 400,000,000 |  |
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 | $ 80,000,000 | 83,000,000 |
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 | $ 597,000,000 | 597,000,000 |
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 | $ 0 |
Debt Instrument, Face Amount | $ 500,000,000 |  |
Debt Instrument, Interest Rate, Stated Percentage | 4.00% |  |

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