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Fair Value - Fair Value Measurements (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Assets, Fair Value Disclosure [Abstract] |  |
Debt securities | $ 16,922 | $ 15,255
U.S. government securities |  |
Assets, Fair Value Disclosure [Abstract] |  |
Debt securities | 1,852 | 1,688
States, municipalities and political subdivisions |  |
Assets, Fair Value Disclosure [Abstract] |  |
Debt securities | 2,309 | 2,399
U.S. corporate securities |  |
Assets, Fair Value Disclosure [Abstract] |  |
Debt securities | 7,737 | 6,489
Foreign securities |  |
Assets, Fair Value Disclosure [Abstract] |  |
Debt securities | 2,348 | 2,383
Residential mortgage-backed securities |  |
Assets, Fair Value Disclosure [Abstract] |  |
Debt securities | 533 | 577
Commercial mortgage-backed securities |  |
Assets, Fair Value Disclosure [Abstract] |  |
Debt securities | 700 | 605
Other asset-backed securities |  |
Assets, Fair Value Disclosure [Abstract] |  |
Debt securities | 1,405 | 1,085
Redeemable preferred securities |  |
Assets, Fair Value Disclosure [Abstract] |  |
Debt securities | 38 | 29
Recurring |  |
Assets, Fair Value Disclosure [Abstract] |  |
Cash and cash equivalents | 5,683 | 4,059
Debt securities | 16,922 | 15,255
Equity securities | 73 | 73
Total | 22,678 | 19,387
Recurring | Level 1 |  |
Assets, Fair Value Disclosure [Abstract] |  |
Cash and cash equivalents | 3,397 | 2,619
Debt securities | 1,785 | 1,597
Equity securities | 34 | 19
Total | 5,216 | 4,235
Recurring | Level 2 |  |
Assets, Fair Value Disclosure [Abstract] |  |
Cash and cash equivalents | 2,286 | 1,440
Debt securities | 15,088 | 13,581
Equity securities | 0 | 0
Total | 17,374 | 15,021
Recurring | Level 3 |  |
Assets, Fair Value Disclosure [Abstract] |  |
Cash and cash equivalents | 0 | 0
Debt securities | 49 | 77
Equity securities | 39 | 54
Total | 88 | 131
Recurring | Brokered Securities | Level 3 |  |
Assets, Fair Value Disclosure [Abstract] |  |
Debt securities |  | 50
Recurring | U.S. government securities |  |
Assets, Fair Value Disclosure [Abstract] |  |
Debt securities | 1,852 | 1,688
Recurring | U.S. government securities | Level 1 |  |
Assets, Fair Value Disclosure [Abstract] |  |
Debt securities | 1,785 | 1,597
Recurring | U.S. government securities | Level 2 |  |
Assets, Fair Value Disclosure [Abstract] |  |
Debt securities | 67 | 91
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 | 2,309 | 2,399
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 | 2,309 | 2,399
Recurring | States, municipalities and political subdivisions | Level 3 |  |
Assets, Fair Value Disclosure [Abstract] |  |
Debt securities | 0 | 0
Recurring | U.S. corporate securities |  |
Assets, Fair Value Disclosure [Abstract] |  |
Debt securities | 7,737 | 6,489
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 | 7,700 | 6,422
Recurring | U.S. corporate securities | Level 3 |  |
Assets, Fair Value Disclosure [Abstract] |  |
Debt securities | 37 | 67
Recurring | Foreign securities |  |
Assets, Fair Value Disclosure [Abstract] |  |
Debt securities | 2,348 | 2,383
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 | 2,348 | 2,380
Recurring | Foreign securities | Level 3 |  |
Assets, Fair Value Disclosure [Abstract] |  |
Debt securities | 0 | 3
Recurring | Residential mortgage-backed securities |  |
Assets, Fair Value Disclosure [Abstract] |  |
Debt securities | 533 | 577
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 | 533 | 577
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 | 700 | 605
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 | 700 | 605
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 | 1,405 | 1,085
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 | 1,405 | 1,085
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 | 38 | 29
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 | 26 | 22
Recurring | Redeemable preferred securities | Level 3 |  |
Assets, Fair Value Disclosure [Abstract] |  |
Debt securities | $ 12 | $ 7

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