|
Segment Information (Net Premiums Earned For Segment By Product) (Detail) (USD $)
In Millions, unless otherwise specified |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
|
Sep. 30, 2014
|
Sep. 30, 2013
|
Sep. 30, 2014
|
Sep. 30, 2013
|
|
| Segment Reporting Information [Line Items] | ||||
| Property & All Other | $ 2,079 | $ 2,067 | $ 5,046 | $ 4,695 |
| Casualty | 1,493 | 1,430 | 4,515 | 4,237 |
| Life, Accident & Health | 1,182 | 1,113 | 3,495 | 3,318 |
| Net premiums earned | 4,754 | 4,610 | 13,056 | 12,250 |
|
Insurance - North American P&C [Member]
|
||||
| Segment Reporting Information [Line Items] | ||||
| Property & All Other | 420 | 388 | 1,248 | 1,103 |
| Casualty | 993 | 957 | 2,992 | 2,826 |
| Life, Accident & Health | 105 | 99 | 307 | 281 |
| Net premiums earned | 1,518 | 1,444 | 4,547 | 4,210 |
|
Insurance - North American Agriculture [Member]
|
||||
| Segment Reporting Information [Line Items] | ||||
| Property & All Other | 766 | 849 | 1,199 | 1,252 |
| Casualty | 0 | 0 | 0 | 0 |
| Life, Accident & Health | 0 | 0 | 0 | 0 |
| Net premiums earned | 766 | 849 | 1,199 | 1,252 |
|
Insurance - Overseas General [Member]
|
||||
| Segment Reporting Information [Line Items] | ||||
| Property & All Other | 744 | 689 | 2,164 | 1,932 |
| Casualty | 394 | 375 | 1,158 | 1,088 |
| Life, Accident & Health | 588 | 547 | 1,725 | 1,613 |
| Net premiums earned | 1,726 | 1,611 | 5,047 | 4,633 |
|
Global Reinsurance [Member]
|
||||
| Segment Reporting Information [Line Items] | ||||
| Property & All Other | 149 | 141 | 435 | 408 |
| Casualty | 106 | 98 | 365 | 323 |
| Net premiums earned | 255 | 239 | 800 | 731 |
|
Life [Member]
|
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| Segment Reporting Information [Line Items] | ||||
| Life, Accident & Health | 489 | 467 | 1,463 | 1,424 |
| Net premiums earned | $ 489 | $ 467 | $ 1,463 | $ 1,424 |