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Fair Value - Fair Value Measurements (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Assets, Fair Value Disclosure [Abstract] |  |
Debt securities | $ 21,188 | $ 16,922
U.S. government securities |  |
Assets, Fair Value Disclosure [Abstract] |  |
Debt securities | 2,469 | 1,852
States, municipalities and political subdivisions |  |
Assets, Fair Value Disclosure [Abstract] |  |
Debt securities | 2,728 | 2,309
U.S. corporate securities |  |
Assets, Fair Value Disclosure [Abstract] |  |
Debt securities | 8,894 | 7,737
Foreign securities |  |
Assets, Fair Value Disclosure [Abstract] |  |
Debt securities | 2,918 | 2,348
Residential mortgage-backed securities |  |
Assets, Fair Value Disclosure [Abstract] |  |
Debt securities | 705 | 533
Commercial mortgage-backed securities |  |
Assets, Fair Value Disclosure [Abstract] |  |
Debt securities | 1,046 | 700
Other asset-backed securities |  |
Assets, Fair Value Disclosure [Abstract] |  |
Debt securities | 2,403 | 1,405
Redeemable preferred securities |  |
Assets, Fair Value Disclosure [Abstract] |  |
Debt securities | 25 | 38
Recurring |  |
Assets, Fair Value Disclosure [Abstract] |  |
Cash and cash equivalents | 8,079 | 5,683
Debt securities | 21,188 | 16,922
Equity securities | 47 | 73
Total | 29,314 | 22,678
Recurring | Level 1 |  |
Assets, Fair Value Disclosure [Abstract] |  |
Cash and cash equivalents | 4,210 | 3,397
Debt securities | 2,370 | 1,785
Equity securities | 17 | 34
Total | 6,597 | 5,216
Recurring | Level 2 |  |
Assets, Fair Value Disclosure [Abstract] |  |
Cash and cash equivalents | 3,869 | 2,286
Debt securities | 18,764 | 15,088
Equity securities | 0 | 0
Total | 22,633 | 17,374
Recurring | Level 3 |  |
Assets, Fair Value Disclosure [Abstract] |  |
Cash and cash equivalents | 0 | 0
Debt securities | 54 | 49
Equity securities | 30 | 39
Total | 84 | 88
Recurring | U.S. government securities |  |
Assets, Fair Value Disclosure [Abstract] |  |
Debt securities | 2,469 | 1,852
Recurring | U.S. government securities | Level 1 |  |
Assets, Fair Value Disclosure [Abstract] |  |
Debt securities | 2,370 | 1,785
Recurring | U.S. government securities | Level 2 |  |
Assets, Fair Value Disclosure [Abstract] |  |
Debt securities | 99 | 67
Recurring | U.S. government securities | Level 3 |  |
Assets, Fair Value Disclosure [Abstract] |  |
Debt securities | 0 | 0
Recurring | States, municipalities and political subdivisions |  |
Assets, Fair Value Disclosure [Abstract] |  |
Debt securities | 2,728 | 2,309
Recurring | States, municipalities and political subdivisions | Level 1 |  |
Assets, Fair Value Disclosure [Abstract] |  |
Debt securities | 0 | 0
Recurring | States, municipalities and political subdivisions | Level 2 |  |
Assets, Fair Value Disclosure [Abstract] |  |
Debt securities | 2,727 | 2,309
Recurring | States, municipalities and political subdivisions | Level 3 |  |
Assets, Fair Value Disclosure [Abstract] |  |
Debt securities | 1 | 0
Recurring | U.S. corporate securities |  |
Assets, Fair Value Disclosure [Abstract] |  |
Debt securities | 8,894 | 7,737
Recurring | U.S. corporate securities | Level 1 |  |
Assets, Fair Value Disclosure [Abstract] |  |
Debt securities | 0 | 0
Recurring | U.S. corporate securities | Level 2 |  |
Assets, Fair Value Disclosure [Abstract] |  |
Debt securities | 8,842 | 7,700
Recurring | U.S. corporate securities | Level 3 |  |
Assets, Fair Value Disclosure [Abstract] |  |
Debt securities | 52 | 37
Recurring | Foreign securities |  |
Assets, Fair Value Disclosure [Abstract] |  |
Debt securities | 2,918 | 2,348
Recurring | Foreign securities | Level 1 |  |
Assets, Fair Value Disclosure [Abstract] |  |
Debt securities | 0 | 0
Recurring | Foreign securities | Level 2 |  |
Assets, Fair Value Disclosure [Abstract] |  |
Debt securities | 2,918 | 2,348
Recurring | Foreign securities | Level 3 |  |
Assets, Fair Value Disclosure [Abstract] |  |
Debt securities | 0 | 0
Recurring | Residential mortgage-backed securities |  |
Assets, Fair Value Disclosure [Abstract] |  |
Debt securities | 705 | 533
Recurring | Residential mortgage-backed securities | Level 1 |  |
Assets, Fair Value Disclosure [Abstract] |  |
Debt securities | 0 | 0
Recurring | Residential mortgage-backed securities | Level 2 |  |
Assets, Fair Value Disclosure [Abstract] |  |
Debt securities | 705 | 533
Recurring | Residential mortgage-backed securities | Level 3 |  |
Assets, Fair Value Disclosure [Abstract] |  |
Debt securities | 0 | 0
Recurring | Commercial mortgage-backed securities |  |
Assets, Fair Value Disclosure [Abstract] |  |
Debt securities | 1,046 | 700
Recurring | Commercial mortgage-backed securities | Level 1 |  |
Assets, Fair Value Disclosure [Abstract] |  |
Debt securities | 0 | 0
Recurring | Commercial mortgage-backed securities | Level 2 |  |
Assets, Fair Value Disclosure [Abstract] |  |
Debt securities | 1,046 | 700
Recurring | Commercial mortgage-backed securities | Level 3 |  |
Assets, Fair Value Disclosure [Abstract] |  |
Debt securities | 0 | 0
Recurring | Other asset-backed securities |  |
Assets, Fair Value Disclosure [Abstract] |  |
Debt securities | 2,403 | 1,405
Recurring | Other asset-backed securities | Level 1 |  |
Assets, Fair Value Disclosure [Abstract] |  |
Debt securities | 0 | 0
Recurring | Other asset-backed securities | Level 2 |  |
Assets, Fair Value Disclosure [Abstract] |  |
Debt securities | 2,403 | 1,405
Recurring | Other asset-backed securities | Level 3 |  |
Assets, Fair Value Disclosure [Abstract] |  |
Debt securities | 0 | 0
Recurring | Redeemable preferred securities |  |
Assets, Fair Value Disclosure [Abstract] |  |
Debt securities | 25 | 38
Recurring | Redeemable preferred securities | Level 1 |  |
Assets, Fair Value Disclosure [Abstract] |  |
Debt securities | 0 | 0
Recurring | Redeemable preferred securities | Level 2 |  |
Assets, Fair Value Disclosure [Abstract] |  |
Debt securities | 24 | 26
Recurring | Redeemable preferred securities | Level 3 |  |
Assets, Fair Value Disclosure [Abstract] |  |
Debt securities | $ 1 | $ 12

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