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Schedule IV (SUPPLEMENTAL INFORMATION CONCERNING REINSURANCE) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items] |  |  |
Direct Amount | $ 46,154 | $ 41,138 | $ 37,037
Ceded To Other Companies | 10,195 | 8,433 | 7,243
Assumed From Other Companies | 4,430 | 3,650 | 3,323
Net Amount | $ 40,389 | $ 36,355 | $ 33,117
Percentage of Amount Assumed to Net | 11.00% | 10.00% | 10.00%
Property and Casualty [Member] |  |  |
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items] |  |  |
Direct Amount | $ 39,449 | $ 35,767 | $ 31,546
Ceded To Other Companies | 9,678 | 7,982 | 6,782
Assumed From Other Companies | 4,242 | 3,441 | 3,044
Net Amount | $ 34,013 | $ 31,226 | $ 27,808
Percentage of Amount Assumed to Net | 12.00% | 11.00% | 11.00%
Accident and Health [Member] |  |  |
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items] |  |  |
Direct Amount | $ 5,206 | $ 4,062 | $ 4,249
Ceded To Other Companies | 411 | 362 | 368
Assumed From Other Companies | 97 | 109 | 111
Net Amount | $ 4,892 | $ 3,809 | $ 3,992
Percentage of Amount Assumed to Net | 2.00% | 3.00% | 3.00%
Life [Member] |  |  |
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items] |  |  |
Direct Amount | $ 1,499 | $ 1,309 | $ 1,242
Ceded To Other Companies | 106 | 89 | 93
Assumed From Other Companies | 91 | 100 | 168
Net Amount | $ 1,484 | $ 1,320 | $ 1,317
Percentage of Amount Assumed to Net | 6.00% | 8.00% | 13.00%

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