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Segment Information (Net Premiums Earned For Segment By Product) (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Segment Reporting Information [Line Items]        
Property & All Other $ 2,060 $ 2,079 $ 5,038 $ 5,046
Casualty 1,548 1,493 4,642 4,515
Life, Accident & Health 1,111 1,182 3,326 3,495
Net premiums earned 4,719 4,754 13,006 13,056
Insurance - North American P&C [Member]        
Segment Reporting Information [Line Items]        
Net premiums earned 1,682 1,518 4,896 4,547
Insurance - North American P&C [Member] | Property Insurance Product Line [Member]        
Segment Reporting Information [Line Items]        
Net premiums earned 511 420 1,428 1,248
Insurance - North American P&C [Member] | Casualty Insurance Product Line [Member]        
Segment Reporting Information [Line Items]        
Net premiums earned 1,063 993 3,157 2,992
Insurance - North American P&C [Member] | Life Accident And Health Product Line [Member]        
Segment Reporting Information [Line Items]        
Net premiums earned 108 105 311 307
Insurance - North American Agriculture [Member]        
Segment Reporting Information [Line Items]        
Net premiums earned 739 766 1,124 1,199
Insurance - North American Agriculture [Member] | Property Insurance Product Line [Member]        
Segment Reporting Information [Line Items]        
Net premiums earned 739 766 1,124 1,199
Insurance - North American Agriculture [Member] | Casualty Insurance Product Line [Member]        
Segment Reporting Information [Line Items]        
Net premiums earned 0 0 0 0
Insurance - North American Agriculture [Member] | Life Accident And Health Product Line [Member]        
Segment Reporting Information [Line Items]        
Net premiums earned 0 0 0 0
Insurance - Overseas General [Member]        
Segment Reporting Information [Line Items]        
Net premiums earned 1,615 1,726 4,896 5,047
Insurance - Overseas General [Member] | Property Insurance Product Line [Member]        
Segment Reporting Information [Line Items]        
Net premiums earned 706 744 2,163 2,164
Insurance - Overseas General [Member] | Casualty Insurance Product Line [Member]        
Segment Reporting Information [Line Items]        
Net premiums earned 386 394 1,159 1,158
Insurance - Overseas General [Member] | Life Accident And Health Product Line [Member]        
Segment Reporting Information [Line Items]        
Net premiums earned 523 588 1,574 1,725
Global Reinsurance [Member]        
Segment Reporting Information [Line Items]        
Net premiums earned 203 255 649 800
Global Reinsurance [Member] | Property Insurance Product Line [Member]        
Segment Reporting Information [Line Items]        
Net premiums earned 104 149 323 435
Global Reinsurance [Member] | Casualty Insurance Product Line [Member]        
Segment Reporting Information [Line Items]        
Net premiums earned 99 106 326 365
Global Reinsurance [Member] | Life Accident And Health Product Line [Member]        
Segment Reporting Information [Line Items]        
Net premiums earned 0 0 0 0
Life [Member]        
Segment Reporting Information [Line Items]        
Net premiums earned 480 489 1,441 1,463
Life [Member] | Property Insurance Product Line [Member]        
Segment Reporting Information [Line Items]        
Net premiums earned 0 0 0 0
Life [Member] | Casualty Insurance Product Line [Member]        
Segment Reporting Information [Line Items]        
Net premiums earned 0 0 0 0
Life [Member] | Life Accident And Health Product Line [Member]        
Segment Reporting Information [Line Items]        
Net premiums earned $ 480 $ 489 $ 1,441 $ 1,463