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Fair Value, Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - Recurring Basis [Member] - USD ($) $ in Millions | Sep. 30, 2021 | Dec. 31, 2020
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Assets and Liabilities Measured at Fair Value [Abstract] |  |
Payable to brokers | $ (119) | $ (43)
Fixed Maturities Available-for-Sale [Member] |  |
Assets and Liabilities Measured at Fair Value [Abstract] |  |
Investments | 45,060 | 44,604
Corporate Bonds and Other [Member] |  |
Assets and Liabilities Measured at Fair Value [Abstract] |  |
Investments | 25,209 | 25,207
States, Municipalities and Political Subdivisions [Member] |  |
Assets and Liabilities Measured at Fair Value [Abstract] |  |
Investments | 11,979 | 11,592
Asset-Backed [Member] |  |
Assets and Liabilities Measured at Fair Value [Abstract] |  |
Investments | 7,872 | 7,805
Fixed Maturities Trading [Member] |  |
Assets and Liabilities Measured at Fair Value [Abstract] |  |
Investments | 9 | 42
Total Fixed Maturities [Member] |  |
Assets and Liabilities Measured at Fair Value [Abstract] |  |
Investments | 45,069 | 44,646
Equity Securities [Member] |  |
Assets and Liabilities Measured at Fair Value [Abstract] |  |
Investments | 1,660 | 1,561
Short Term and Other [Member] |  |
Assets and Liabilities Measured at Fair Value [Abstract] |  |
Investments | 4,063 | 4,577
Level 1 [Member] |  |
Assets and Liabilities Measured at Fair Value [Abstract] |  |
Payable to brokers | (118) | (14)
Level 1 [Member] | Fixed Maturities Available-for-Sale [Member] |  |
Assets and Liabilities Measured at Fair Value [Abstract] |  |
Investments | 146 | 355
Level 1 [Member] | Corporate Bonds and Other [Member] |  |
Assets and Liabilities Measured at Fair Value [Abstract] |  |
Investments | 146 | 355
Level 1 [Member] | Total Fixed Maturities [Member] |  |
Assets and Liabilities Measured at Fair Value [Abstract] |  |
Investments | 146 | 355
Level 1 [Member] | Equity Securities [Member] |  |
Assets and Liabilities Measured at Fair Value [Abstract] |  |
Investments | 890 | 796
Level 1 [Member] | Short Term and Other [Member] |  |
Assets and Liabilities Measured at Fair Value [Abstract] |  |
Investments | 4,063 | 4,538
Level 2 [Member] |  |
Assets and Liabilities Measured at Fair Value [Abstract] |  |
Payable to brokers | (1) | (29)
Level 2 [Member] | Fixed Maturities Available-for-Sale [Member] |  |
Assets and Liabilities Measured at Fair Value [Abstract] |  |
Investments | 43,502 | 43,125
Level 2 [Member] | Corporate Bonds and Other [Member] |  |
Assets and Liabilities Measured at Fair Value [Abstract] |  |
Investments | 24,186 | 24,082
Level 2 [Member] | States, Municipalities and Political Subdivisions [Member] |  |
Assets and Liabilities Measured at Fair Value [Abstract] |  |
Investments | 11,922 | 11,546
Level 2 [Member] | Asset-Backed [Member] |  |
Assets and Liabilities Measured at Fair Value [Abstract] |  |
Investments | 7,394 | 7,497
Level 2 [Member] | Fixed Maturities Trading [Member] |  |
Assets and Liabilities Measured at Fair Value [Abstract] |  |
Investments | 9 | 34
Level 2 [Member] | Total Fixed Maturities [Member] |  |
Assets and Liabilities Measured at Fair Value [Abstract] |  |
Investments | 43,511 | 43,159
Level 2 [Member] | Equity Securities [Member] |  |
Assets and Liabilities Measured at Fair Value [Abstract] |  |
Investments | 745 | 722
Level 2 [Member] | Short Term and Other [Member] |  |
Assets and Liabilities Measured at Fair Value [Abstract] |  |
Investments |  | 39
Level 3 [Member] | Fixed Maturities Available-for-Sale [Member] |  |
Assets and Liabilities Measured at Fair Value [Abstract] |  |
Investments | 1,412 | 1,124
Level 3 [Member] | Corporate Bonds and Other [Member] |  |
Assets and Liabilities Measured at Fair Value [Abstract] |  |
Investments | 877 | 770
Level 3 [Member] | States, Municipalities and Political Subdivisions [Member] |  |
Assets and Liabilities Measured at Fair Value [Abstract] |  |
Investments | 57 | 46
Level 3 [Member] | Asset-Backed [Member] |  |
Assets and Liabilities Measured at Fair Value [Abstract] |  |
Investments | 478 | 308
Level 3 [Member] | Fixed Maturities Trading [Member] |  |
Assets and Liabilities Measured at Fair Value [Abstract] |  |
Investments |  | 8
Level 3 [Member] | Total Fixed Maturities [Member] |  |
Assets and Liabilities Measured at Fair Value [Abstract] |  |
Investments | 1,412 | 1,132
Level 3 [Member] | Equity Securities [Member] |  |
Assets and Liabilities Measured at Fair Value [Abstract] |  |
Investments | $ 25 | $ 43

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