Acquisitions and Dispositions - Great American Supplemental Benefits Group Condensed Balance Sheet (Details) (Great American Supplemental Benefits Group [Member], USD $) In Millions, unless otherwise specified	Aug. 31, 2012
Great American Supplemental Benefits Group [Member]
Condensed Balance Sheet At Acquisition Date
Investments	$ 211
Cash and cash equivalents	36
Reinsurance recoverables	448
Goodwill	168
Value of business acquired (reported in Deferred policy acquisition costs in the Consolidated Balance Sheet)	144
Other assets, including other intangibles	35
Total assets acquired	1,042
Insurance liabilities	707
Accounts payable, accrued expenses and other liabilities	9
Total liabilities acquired	716
Net assets acquired	$ 326