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Reinsurance - Effects of Reinsurance (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Premiums Earned, Net [Abstract] |  |  |
Direct | $ 85,670 | $ 76,320 | $ 69,711
Assumed | 432 | 492 | 478
Ceded | (772) | (680) | (825)
Net premiums | 85,330 | 76,132 | 69,364
Policyholder Benefits and Claims Incurred, Net [Abstract] |  |  |
Direct | 71,357 | 64,339 | 56,077
Assumed | 379 | 398 | 329
Ceded | (663) | (549) | (727)
Net benefit costs | $ 71,073 | $ 64,188 | $ 55,679

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