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Schedule IV (SUPPLEMENTAL INFORMATION CONCERNING REINSURANCE) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items] |  |  |  |  |  |  |  |  |  |  |
Direct Amount |  |  |  |  |  |  |  |  | $ 35,876 | $ 34,108 | $ 32,782
Ceded To Other Companies |  |  |  |  |  |  |  |  | 7,693 | 7,219 | 7,080
Assumed From Other Companies |  |  |  |  |  |  |  |  | 3,107 | 3,175 | 3,332
Net Amount | $ 7,935 | $ 8,327 | $ 7,891 | $ 7,137 | $ 7,465 | $ 7,908 | $ 7,664 | $ 7,027 | $ 31,290 | $ 30,064 | $ 29,034
Percentage of Amount Assumed to Net |  |  |  |  |  |  |  |  | 10.00% | 11.00% | 11.00%
Property and Casualty [Member] |  |  |  |  |  |  |  |  |  |  |
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items] |  |  |  |  |  |  |  |  |  |  |
Direct Amount |  |  |  |  |  |  |  |  | $ 30,339 | $ 28,793 | $ 27,774
Ceded To Other Companies |  |  |  |  |  |  |  |  | 7,236 | 6,792 | 6,650
Assumed From Other Companies |  |  |  |  |  |  |  |  | 2,797 | 2,812 | 2,891
Net Amount |  |  |  |  |  |  |  |  | $ 25,900 | $ 24,813 | $ 24,015
Percentage of Amount Assumed to Net |  |  |  |  |  |  |  |  | 11.00% | 11.00% | 12.00%
Accident and Health [Member] |  |  |  |  |  |  |  |  |  |  |
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items] |  |  |  |  |  |  |  |  |  |  |
Direct Amount |  |  |  |  |  |  |  |  | $ 4,546 | $ 4,409 | $ 4,167
Ceded To Other Companies |  |  |  |  |  |  |  |  | 376 | 342 | 349
Assumed From Other Companies |  |  |  |  |  |  |  |  | 119 | 162 | 221
Net Amount |  |  |  |  |  |  |  |  | $ 4,289 | $ 4,229 | $ 4,039
Percentage of Amount Assumed to Net |  |  |  |  |  |  |  |  | 3.00% | 4.00% | 5.00%
Life [Member] |  |  |  |  |  |  |  |  |  |  |
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items] |  |  |  |  |  |  |  |  |  |  |
Direct Amount |  |  |  |  |  |  |  |  | $ 991 | $ 906 | $ 841
Ceded To Other Companies |  |  |  |  |  |  |  |  | 81 | 85 | 81
Assumed From Other Companies |  |  |  |  |  |  |  |  | 191 | 201 | 220
Net Amount |  |  |  |  |  |  |  |  | $ 1,101 | $ 1,022 | $ 980
Percentage of Amount Assumed to Net |  |  |  |  |  |  |  |  | 17.00% | 20.00% | 22.00%

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