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Fair Value, Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - Recurring Basis [Member] - USD ($) $ in Millions | Jun. 30, 2021 | Dec. 31, 2020
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Payable to Brokers [Member] |  |
Assets and Liabilities Measured at Fair Value [Abstract] |  |
Liabilities | $ (96) | $ (43)
Fixed Maturities Available-for-Sale [Member] |  |
Assets and Liabilities Measured at Fair Value [Abstract] |  |
Assets | 44,900 | 44,604
Corporate Bonds and Other [Member] |  |
Assets and Liabilities Measured at Fair Value [Abstract] |  |
Assets | 25,058 | 25,207
States, Municipalities and Political Subdivisions [Member] |  |
Assets and Liabilities Measured at Fair Value [Abstract] |  |
Assets | 11,866 | 11,592
Asset-Backed [Member] |  |
Assets and Liabilities Measured at Fair Value [Abstract] |  |
Assets | 7,976 | 7,805
Fixed Maturities Trading [Member] |  |
Assets and Liabilities Measured at Fair Value [Abstract] |  |
Assets | 10 | 42
Total Fixed Maturities [Member] |  |
Assets and Liabilities Measured at Fair Value [Abstract] |  |
Assets | 44,910 | 44,646
Equity Securities [Member] |  |
Assets and Liabilities Measured at Fair Value [Abstract] |  |
Assets | 1,663 | 1,561
Short Term and Other [Member] |  |
Assets and Liabilities Measured at Fair Value [Abstract] |  |
Assets | 4,698 | 4,577
Level 1 [Member] | Payable to Brokers [Member] |  |
Assets and Liabilities Measured at Fair Value [Abstract] |  |
Liabilities | (94) | (14)
Level 1 [Member] | Fixed Maturities Available-for-Sale [Member] |  |
Assets and Liabilities Measured at Fair Value [Abstract] |  |
Assets | 158 | 355
Level 1 [Member] | Corporate Bonds and Other [Member] |  |
Assets and Liabilities Measured at Fair Value [Abstract] |  |
Assets | 158 | 355
Level 1 [Member] | Total Fixed Maturities [Member] |  |
Assets and Liabilities Measured at Fair Value [Abstract] |  |
Assets | 158 | 355
Level 1 [Member] | Equity Securities [Member] |  |
Assets and Liabilities Measured at Fair Value [Abstract] |  |
Assets | 884 | 796
Level 1 [Member] | Short Term and Other [Member] |  |
Assets and Liabilities Measured at Fair Value [Abstract] |  |
Assets | 4,661 | 4,538
Level 2 [Member] | Payable to Brokers [Member] |  |
Assets and Liabilities Measured at Fair Value [Abstract] |  |
Liabilities | (2) | (29)
Level 2 [Member] | Fixed Maturities Available-for-Sale [Member] |  |
Assets and Liabilities Measured at Fair Value [Abstract] |  |
Assets | 43,392 | 43,125
Level 2 [Member] | Corporate Bonds and Other [Member] |  |
Assets and Liabilities Measured at Fair Value [Abstract] |  |
Assets | 24,017 | 24,082
Level 2 [Member] | States, Municipalities and Political Subdivisions [Member] |  |
Assets and Liabilities Measured at Fair Value [Abstract] |  |
Assets | 11,809 | 11,546
Level 2 [Member] | Asset-Backed [Member] |  |
Assets and Liabilities Measured at Fair Value [Abstract] |  |
Assets | 7,566 | 7,497
Level 2 [Member] | Fixed Maturities Trading [Member] |  |
Assets and Liabilities Measured at Fair Value [Abstract] |  |
Assets | 10 | 34
Level 2 [Member] | Total Fixed Maturities [Member] |  |
Assets and Liabilities Measured at Fair Value [Abstract] |  |
Assets | 43,402 | 43,159
Level 2 [Member] | Equity Securities [Member] |  |
Assets and Liabilities Measured at Fair Value [Abstract] |  |
Assets | 743 | 722
Level 2 [Member] | Short Term and Other [Member] |  |
Assets and Liabilities Measured at Fair Value [Abstract] |  |
Assets | 37 | 39
Level 3 [Member] | Fixed Maturities Available-for-Sale [Member] |  |
Assets and Liabilities Measured at Fair Value [Abstract] |  |
Assets | 1,350 | 1,124
Level 3 [Member] | Corporate Bonds and Other [Member] |  |
Assets and Liabilities Measured at Fair Value [Abstract] |  |
Assets | 883 | 770
Level 3 [Member] | States, Municipalities and Political Subdivisions [Member] |  |
Assets and Liabilities Measured at Fair Value [Abstract] |  |
Assets | 57 | 46
Level 3 [Member] | Asset-Backed [Member] |  |
Assets and Liabilities Measured at Fair Value [Abstract] |  |
Assets | 410 | 308
Level 3 [Member] | Fixed Maturities Trading [Member] |  |
Assets and Liabilities Measured at Fair Value [Abstract] |  |
Assets |  | 8
Level 3 [Member] | Total Fixed Maturities [Member] |  |
Assets and Liabilities Measured at Fair Value [Abstract] |  |
Assets | 1,350 | 1,132
Level 3 [Member] | Equity Securities [Member] |  |
Assets and Liabilities Measured at Fair Value [Abstract] |  |
Assets | $ 36 | $ 43

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