SCHEDULE VI - SUPPLEMENTARY INFORMATION CONCERNING CONSOLIDATED PROPERTY-CASUALTY INSURANCE OPERATIONS (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Supplemental Information for Property, Casualty Insurance Underwriters [Abstract]
Deferred policy acquisition costs	$ 2,029	$ 1,820	$ 1,625
Reserves for insurance claims and claims expense	23,869	22,923	21,857
Unearned premiums	12,189	11,640	10,917
Earned premiums	30,309	28,929	27,618
Net investment income	1,237	1,301	1,375
Claims and claims adjustment expense incurred
Current Year Claims and Claims Adjustment Expense	20,953	19,512	18,032
Prior years	81	(84)	(121)
Amortization of deferred policy acquisition costs	4,102	3,875	3,674
Paid claims and claims adjustment expense	20,286	19,392	17,996
Premiums written	$ 30,871	$ 29,614	$ 28,164