Reporting Segments (Details 4) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Segment Reporting Information
Assets	$ 123,520	$ 126,947	$ 125,193
Investments	81,155	97,278	95,618
Property-Liability
Segment Reporting Information
Assets	54,726	52,201	49,791
Investments	39,638	38,215	35,998
Allstate Financial
Segment Reporting Information
Assets	65,707	72,368	72,526
Investments	39,105	56,999	57,373
Corporate and Other
Segment Reporting Information
Assets	3,087	2,378	2,876
Investments	$ 2,412	$ 2,064	$ 2,247