Acquisitions and Sale of Businesses (Details) (Run-off long-term care insurance business [Member], USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015
Run-off long-term care insurance business [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Estimated sale proceeds	$ 14	[1]
Assets of businesses sold:
Cash and investments	1,397
Recoverables from reinsurers	603
Deferred policy acquisition costs	15
Other receivables	14
Other assets	7
Goodwill	2
Total assets	2,038
Liabilities of businesses sold:
Annuity benefits accumulated	270
Life, accident and health reserves	1,537
Other liabilities	27
Total liabilities	1,834
Reclassify net unrealized gain on marketable securities	28
Net assets of businesses sold	176
Pretax loss on subsidiaries	$ (162)

[1] Includes fair value of the potential additional consideration and is shown net of estimated expenses.