Supplemental Cash Flow Information (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Supplemental Cash Flow Information [Abstract]
Non-cash modifications of certain mortgage loans, fixed income securities, limited partnership interests and other investments, as well as mergers completed with equity securities	$ 84	$ 105
Non-cash financing activities related to the issuance of shares for vested restricted stock units	74	46
Obligation to fund limited partnership investment	90
Net change in proceeds managed
Net change in short-term investments	(2)	(162)
Operating cash flow used	(2)	(162)
Net change in cash	1	7
Net change in proceeds managed	(1)	(155)
Net change in liabilities
Liabilities for collateral, beginning of period	(782)	(624)
Liabilities for collateral, end of period	(783)	(779)
Operating cash flow provided	$ 1	$ 155