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Reinsurance (Consolidated Reinsurance) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Premiums written [Abstract] |  |  |
Direct | $ 52,969 | $ 47,511 | $ 42,811
Assumed | 4,557 | 4,467 | 3,928
Ceded | (10,165) | (10,258) | (8,912)
Net | 47,361 | 41,720 | 37,827
Premiums earned [Abstract] |  |  |
Direct | 51,582 | 46,160 | 41,116
Assumed | 4,289 | 4,395 | 3,609
Ceded | (10,159) | (10,195) | (8,433)
Net premiums earned | 45,712 | 40,360 | 36,292
Policyholder Benefits and Claims Incurred, Ceded | $ 7,200 | $ 6,900 | $ 5,900

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