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Fair Value, Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - Recurring Basis [Member] - USD ($) $ in Millions | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Payable to Brokers [Member] |  |  |
Assets and Liabilities Measured at Fair Value [Abstract] |  |  |
Liabilities | $ (73) | [1] | $ (43)
Fixed Maturities Available-for-Sale [Member] |  |  |
Assets and Liabilities Measured at Fair Value [Abstract] |  |  |
Assets | 43,545 |  | 44,604
Corporate Bonds and Other [Member] |  |  |
Assets and Liabilities Measured at Fair Value [Abstract] |  |  |
Assets | 24,329 |  | 25,207
States, Municipalities and Political Subdivisions [Member] |  |  |
Assets and Liabilities Measured at Fair Value [Abstract] |  |  |
Assets | 11,600 |  | 11,592
Asset-Backed [Member] |  |  |
Assets and Liabilities Measured at Fair Value [Abstract] |  |  |
Assets | 7,616 |  | 7,805
Fixed Maturities Trading [Member] |  |  |
Assets and Liabilities Measured at Fair Value [Abstract] |  |  |
Assets | 39 |  | 42
Total Fixed Maturities [Member] |  |  |
Assets and Liabilities Measured at Fair Value [Abstract] |  |  |
Assets | 43,584 |  | 44,646
Equity Securities [Member] |  |  |
Assets and Liabilities Measured at Fair Value [Abstract] |  |  |
Assets | 1,580 |  | 1,561
Short Term and Other [Member] |  |  |
Assets and Liabilities Measured at Fair Value [Abstract] |  |  |
Assets | 4,176 | [1] | 4,577
Level 1 [Member] | Payable to Brokers [Member] |  |  |
Assets and Liabilities Measured at Fair Value [Abstract] |  |  |
Liabilities | (71) | [1] | (14)
Level 1 [Member] | Fixed Maturities Available-for-Sale [Member] |  |  |
Assets and Liabilities Measured at Fair Value [Abstract] |  |  |
Assets | 152 |  | 355
Level 1 [Member] | Corporate Bonds and Other [Member] |  |  |
Assets and Liabilities Measured at Fair Value [Abstract] |  |  |
Assets | 152 |  | 355
Level 1 [Member] | Total Fixed Maturities [Member] |  |  |
Assets and Liabilities Measured at Fair Value [Abstract] |  |  |
Assets | 152 |  | 355
Level 1 [Member] | Equity Securities [Member] |  |  |
Assets and Liabilities Measured at Fair Value [Abstract] |  |  |
Assets | 824 |  | 796
Level 1 [Member] | Short Term and Other [Member] |  |  |
Assets and Liabilities Measured at Fair Value [Abstract] |  |  |
Assets | 4,140 | [1] | 4,538
Level 2 [Member] | Payable to Brokers [Member] |  |  |
Assets and Liabilities Measured at Fair Value [Abstract] |  |  |
Liabilities | (2) | [1] | (29)
Level 2 [Member] | Fixed Maturities Available-for-Sale [Member] |  |  |
Assets and Liabilities Measured at Fair Value [Abstract] |  |  |
Assets | 42,267 |  | 43,125
Level 2 [Member] | Corporate Bonds and Other [Member] |  |  |
Assets and Liabilities Measured at Fair Value [Abstract] |  |  |
Assets | 23,410 |  | 24,082
Level 2 [Member] | States, Municipalities and Political Subdivisions [Member] |  |  |
Assets and Liabilities Measured at Fair Value [Abstract] |  |  |
Assets | 11,556 |  | 11,546
Level 2 [Member] | Asset-Backed [Member] |  |  |
Assets and Liabilities Measured at Fair Value [Abstract] |  |  |
Assets | 7,301 |  | 7,497
Level 2 [Member] | Fixed Maturities Trading [Member] |  |  |
Assets and Liabilities Measured at Fair Value [Abstract] |  |  |
Assets | 34 |  | 34
Level 2 [Member] | Total Fixed Maturities [Member] |  |  |
Assets and Liabilities Measured at Fair Value [Abstract] |  |  |
Assets | 42,301 |  | 43,159
Level 2 [Member] | Equity Securities [Member] |  |  |
Assets and Liabilities Measured at Fair Value [Abstract] |  |  |
Assets | 711 |  | 722
Level 2 [Member] | Short Term and Other [Member] |  |  |
Assets and Liabilities Measured at Fair Value [Abstract] |  |  |
Assets | 36 | [1] | 39
Level 3 [Member] | Fixed Maturities Available-for-Sale [Member] |  |  |
Assets and Liabilities Measured at Fair Value [Abstract] |  |  |
Assets | 1,126 |  | 1,124
Level 3 [Member] | Corporate Bonds and Other [Member] |  |  |
Assets and Liabilities Measured at Fair Value [Abstract] |  |  |
Assets | 767 |  | 770
Level 3 [Member] | States, Municipalities and Political Subdivisions [Member] |  |  |
Assets and Liabilities Measured at Fair Value [Abstract] |  |  |
Assets | 44 |  | 46
Level 3 [Member] | Asset-Backed [Member] |  |  |
Assets and Liabilities Measured at Fair Value [Abstract] |  |  |
Assets | 315 |  | 308
Level 3 [Member] | Fixed Maturities Trading [Member] |  |  |
Assets and Liabilities Measured at Fair Value [Abstract] |  |  |
Assets | 5 |  | 8
Level 3 [Member] | Total Fixed Maturities [Member] |  |  |
Assets and Liabilities Measured at Fair Value [Abstract] |  |  |
Assets | 1,131 |  | 1,132
Level 3 [Member] | Equity Securities [Member] |  |  |
Assets and Liabilities Measured at Fair Value [Abstract] |  |  |
Assets | $ 45 |  | $ 43
[1] | As of March 31, 2021, Short term and other and Payable to brokers exclude amounts classified as held for sale. See Note 2 for further discussion.

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