Reinsurance (Details 3) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Premiums earned:
Direct	$ 4,969	$ 4,562	$ 4,272
Assumed	24	21	21
Ceded	(95)	(90)	(79)
Premiums earned, net	4,898	4,493	4,214
Insurance losses and loss expenses:
Insurance losses and loss expenses, net	3,467	3,480	3,444
Property and casualty insurance operations
Premiums written:
Direct	5,076	4,631	4,271
Assumed	26	21	21
Ceded	(57)	(49)	(37)
Premiums written, net	5,045	4,603	4,255
Premiums earned:
Direct	4,850	4,449	4,164
Assumed	24	21	21
Ceded	(54)	(48)	(36)
Premiums earned, net	4,820	4,422	4,149
Insurance losses and loss expenses:
Direct	3,366	3,382	3,311
Assumed	7	10	11
Ceded	(13)	(13)	22
Insurance losses and loss expenses, net	3,360	3,379	3,344
Life insurance operations
Premiums earned:
Direct	119	113	108
Ceded	(41)	(42)	(43)
Premiums earned, net	78	71	65
Insurance losses and loss expenses:
Direct	124	120	120
Ceded	(17)	(19)	(20)
Insurance losses and loss expenses, net	$ 107	$ 101	$ 100