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Reinsurance - Effects of Reinsurance (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Premiums Earned, Net [Abstract] |  |  |
Direct | $ 69,711 | $ 62,968 | $ 8,365
Assumed | 478 | 2,108 | 38
Ceded | (825) | (1,954) | (219)
Net premiums | 69,364 | 63,122 | 8,184
Policyholder Benefits and Claims Incurred, Net [Abstract] |  |  |
Direct | 56,077 | 52,592 | 6,773
Assumed | 329 | 1,562 | 32
Ceded | (727) | (1,625) | (211)
Net benefit costs | $ 55,679 | $ 52,529 | $ 6,594

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