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Schedule IV (SUPPLEMENTAL INFORMATION CONCERNING REINSURANCE) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items] |  |  |  |  |  |  |  |  |  |  |
Direct Amount |  |  |  |  |  |  |  |  | $ 34,108 | $ 32,782 | $ 31,811
Ceded To Other Companies |  |  |  |  |  |  |  |  | 7,219 | 7,080 | 6,806
Assumed From Other Companies |  |  |  |  |  |  |  |  | 3,175 | 3,332 | 3,744
Net Amount | $ 7,465 | $ 7,908 | $ 7,664 | $ 7,027 | $ 7,218 | $ 7,807 | $ 7,237 | $ 6,772 | $ 30,064 | $ 29,034 | $ 28,749
Percentage of Amount Assumed to Net |  |  |  |  |  |  |  |  | 11.00% | 11.00% | 13.00%
Property and Casualty [Member] |  |  |  |  |  |  |  |  |  |  |
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items] |  |  |  |  |  |  |  |  |  |  |
Direct Amount |  |  |  |  |  |  |  |  | $ 28,793 | $ 27,774 | $ 26,919
Ceded To Other Companies |  |  |  |  |  |  |  |  | 6,792 | 6,650 | 6,407
Assumed From Other Companies |  |  |  |  |  |  |  |  | 2,812 | 2,891 | 3,284
Net Amount |  |  |  |  |  |  |  |  | $ 24,813 | $ 24,015 | $ 23,796
Percentage of Amount Assumed to Net |  |  |  |  |  |  |  |  | 11.00% | 12.00% | 14.00%
Accident and Health [Member] |  |  |  |  |  |  |  |  |  |  |
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items] |  |  |  |  |  |  |  |  |  |  |
Direct Amount |  |  |  |  |  |  |  |  | $ 4,409 | $ 4,167 | $ 4,047
Ceded To Other Companies |  |  |  |  |  |  |  |  | 342 | 349 | 315
Assumed From Other Companies |  |  |  |  |  |  |  |  | 162 | 221 | 219
Net Amount |  |  |  |  |  |  |  |  | $ 4,229 | $ 4,039 | $ 3,951
Percentage of Amount Assumed to Net |  |  |  |  |  |  |  |  | 4.00% | 5.00% | 6.00%
Life [Member] |  |  |  |  |  |  |  |  |  |  |
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items] |  |  |  |  |  |  |  |  |  |  |
Direct Amount |  |  |  |  |  |  |  |  | $ 906 | $ 841 | $ 845
Ceded To Other Companies |  |  |  |  |  |  |  |  | 85 | 81 | 84
Assumed From Other Companies |  |  |  |  |  |  |  |  | 201 | 220 | 241
Net Amount |  |  |  |  |  |  |  |  | $ 1,022 | $ 980 | $ 1,002
Percentage of Amount Assumed to Net |  |  |  |  |  |  |  |  | 20.00% | 22.00% | 24.00%

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