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 partnership interests and other investments, as well as mergers completed with equity securities	$ 54	$ 86
Non-cash financing activities related to the issuance of shares for vested restricted stock units	72	45
Net change in proceeds managed
Net change in short-term investments	34	(284)
Operating cash flow provided (used)	34	(284)
Net change in cash	(3)	1
Net change in proceeds managed	31	(283)
Net change in liabilities
Liabilities for collateral, beginning of period	(782)	(624)
Liabilities for collateral, end of period	(751)	(907)
Operating cash flow (used) provided	$ (31)	$ 283