SCHEDULE VI SUPPLEMENTAL INFORMATION CONCERNING PROPERTY-CASUALTY INSURANCE OPERATIONS (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
SUPPLEMENTAL INFORMATION CONCERNING PROPERTY-CASUALTY INSURANCE OPERATIONS
Deferred policy acquisition costs	$ 440	$ 402	$ 364
Reserve for unpaid losses and loss expenses	3,853	3,747	3,598
Discount, if any, deducted from reserves	89	85	85
Unearned premiums	2,834	2,598	2,365
Earned premiums	5,260	4,820	4,422
Net investment income	334	313	327
Current accident year	3,969	3,379	3,494
Prior accident years	(116)	(19)	(115)
Amortization of deferred policy acquisition costs	836	763	705
Net losses and loss expenses paid	3,733	3,213	3,283
Net premiums written	5,487	5,045	4,603
Consolidated P&C Entities
SUPPLEMENTAL INFORMATION CONCERNING PROPERTY-CASUALTY INSURANCE OPERATIONS
Deferred policy acquisition costs	440	402	364
Reserve for unpaid losses and loss expenses	3,853	3,747	3,598
Discount, if any, deducted from reserves	89	85	85
Unearned premiums	2,834	2,598	2,365
Earned premiums	5,260	4,820	4,422
Net investment income	334	313	327
Current accident year	3,969	3,379	3,494
Prior accident years	(116)	(19)	(115)
Amortization of deferred policy acquisition costs	836	763	705
Net losses and loss expenses paid	3,733	3,213	3,283
Net premiums written	$ 5,487	$ 5,045	$ 4,603
Discount rate for workers compensation case and incurred but not reported loss reserves (as a percent)	2.50%	2.50%	2.50%