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Schedule VI. Supplemental Information Concerning Property and Casualty Insurance Operations (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Incurred claim and claim adjustment expenses related to current year $ 5,273 $ 4,904 $ 4,741
Incurred claim and claim adjustment expenses related to prior years (182) (429) (544)
Consolidated Property and Casualty Insurance Entity [Member]
      
Deferred acquisition costs 598 552   
Reserves for unpaid claim and claim adjustment expenses 24,696 24,228   
Discount deducted from claim and claim adjustment expense reserves above (based on interest rates ranging from 3.0% to 9.7%) 1,850 1,569   
Unearned Premiums 3,610 3,250   
Net written premiums 6,964 6,798 6,471
Net earned premiums 6,881 6,603 6,514
Net investment income 2,074 1,845 2,097
Incurred claim and claim adjustment expenses related to current year 5,266 4,901 4,737
Incurred claim and claim adjustment expenses related to prior years (180) (429) (545)
Amortization of deferred acquisition costs 1,274 1,176 1,168
Paid claim and claim adjustment expenses $ 5,257 $ 4,499 $ 4,667
Supplemental Information Parenthetical      
Minimum interest rate in discount range 3.00%    
Maximum interest rate in discount range 9.70%