Discontinued Operations (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal Group Including Discontinued Operation Fee Income and Other		$ 133
Disposal Group Including Discontinued Operation Amortization of Deferred Policy Acquisition Costs and Present Value of Future Profits		9
Revenue
Total revenues		133
Benefits, losses and expenses
Insurance operating and other expenses		93
Total benefits, losses and expenses		102
Income (loss) before income taxes		31
Income tax expense (benefit)		11
Net realized capital gain on disposal, net of tax	1,560	0
Income (loss) from discontinued operations, net of tax		$ 20