Acquisition 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	3 Months Ended	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2015
Life, accident and health net earned premiums:
Long-term care	$ 19	$ 56
Life operations	3	8
Net investment income	19	56
Realized gains (losses) on securities and other income	(4)	(6)
Total revenues	37	114
Annuity benefits	2	6
Life, accident and health benefits:
Long-term care	21	67
Life operations	3	8
Annuity and supplemental insurance acquisition expenses	3	9
Other expenses	4	13
Total costs and expenses	33	103
Earnings before income taxes	$ 4	$ 11