Acquisitions and Sale of Businesses - Revenues, costs and expenses, and earnings before income taxes for the subsidiaries sold (Details) - Run-off long-term care insurance business - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Life, accident and health net earned premiums:
Long-term care	$ 73	$ 74
Life operations	11	11
Net investment income	73	75
Realized gains (losses) on securities and other income	(11)	(6)
Total revenues	146	154
Annuity benefits	8	7
Life, accident and health benefits:
Long-term care	91	119
Life operations	11	11
Annuity and supplemental insurance acquisition expenses	12	11
Other expenses	16	14
Total costs and expenses	138	162
Earnings before income taxes	$ 8	$ (8)