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Reinsurance - Effects of Reinsurance (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Net Premiums |  |  |
Direct | $ 99,753 | $ 85,670 | $ 76,320
Assumed | 350 | 432 | 492
Ceded | (911) | (772) | (680)
Net premiums | 99,192 | 85,330 | 76,132
Net Benefit Costs |  |  |
Direct | 86,738 | 71,357 | 64,339
Assumed | 223 | 379 | 398
Ceded | (714) | (663) | (549)
Net benefit costs | $ 86,247 | $ 71,073 | $ 64,188

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