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Schedule IV (SUPPLEMENTAL INFORMATION CONCERNING REINSURANCE) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of Amount Assumed to Net |  |  |  |  |  |  |  |  | 11.00% | 13.00% | 21.00%
Net Amount | $ 7,218 | $ 7,807 | $ 7,237 | $ 6,772 | $ 7,059 | $ 7,688 | $ 7,405 | $ 6,597 | $ 29,034 | $ 28,749 | $ 17,213
Assumed From Other Companies |  |  |  |  |  |  |  |  | 3,332 | 3,744 | 3,676
Ceded To Other Companies |  |  |  |  |  |  |  |  | 7,080 | 6,806 | 5,818
Direct Amount |  |  |  |  |  |  |  |  | $ 32,782 | $ 31,811 | $ 19,355
Property and Casualty [Member] |  |  |  |  |  |  |  |  |  |  |
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of Amount Assumed to Net |  |  |  |  |  |  |  |  | 12.00% | 14.00% | 25.00%
Net Amount |  |  |  |  |  |  |  |  | $ 24,015 | $ 23,796 | $ 12,781
Assumed From Other Companies |  |  |  |  |  |  |  |  | 2,891 | 3,284 | 3,259
Ceded To Other Companies |  |  |  |  |  |  |  |  | 6,650 | 6,407 | 5,373
Direct Amount |  |  |  |  |  |  |  |  | $ 27,774 | $ 26,919 | $ 14,895
Accident and Health [Member] |  |  |  |  |  |  |  |  |  |  |
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of Amount Assumed to Net |  |  |  |  |  |  |  |  | 5.00% | 6.00% | 5.00%
Net Amount |  |  |  |  |  |  |  |  | $ 4,039 | $ 3,951 | $ 3,501
Assumed From Other Companies |  |  |  |  |  |  |  |  | 221 | 219 | 168
Ceded To Other Companies |  |  |  |  |  |  |  |  | 349 | 315 | 351
Direct Amount |  |  |  |  |  |  |  |  | $ 4,167 | $ 4,047 | $ 3,684
Life [Member] |  |  |  |  |  |  |  |  |  |  |
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of Amount Assumed to Net |  |  |  |  |  |  |  |  | 22.00% | 24.00% | 27.00%
Net Amount |  |  |  |  |  |  |  |  | $ 980 | $ 1,002 | $ 931
Assumed From Other Companies |  |  |  |  |  |  |  |  | 220 | 241 | 249
Ceded To Other Companies |  |  |  |  |  |  |  |  | 81 | 84 | 94
Direct Amount |  |  |  |  |  |  |  |  | $ 841 | $ 845 | $ 776

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