Supplemental Cash Flow Information (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Supplemental Cash Flow Information [Abstract]
Non-cash modifications of certain mortgage loans, fixed income securities, limited partnerships and other investments, as well as mergers completed with equity securities	$ 42	$ 77
Net change in proceeds managed
Net change in short-term investments	45	(282)
Operating cash flow provided (used)	45	(282)
Net change in liabilities
Liabilities for collateral, beginning of period	(510)	(328)
Liabilities for collateral, end of period	(465)	(610)
Operating cash flow (used) provided	$ (45)	$ 282