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Reinsurance - Effects of Reinsurance (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Premiums Earned, Net [Abstract] |  |  |
Direct | $ 62,968 | $ 8,365 |
Assumed | 2,108 | 38 |
Ceded | (1,954) | (219) |
Net premiums | 63,122 | 8,184 | $ 3,558
Policyholder Benefits and Claims Incurred, Net [Abstract] |  |  |
Direct | 52,592 | 6,773 |
Assumed | 1,562 | 32 |
Ceded | (1,625) | (211) |
Net benefit costs | $ 52,529 | $ 6,594 |

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