Investments- Net Ivestment Income (Details 3) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Net investment income
Investment income, before expense	$ 480	$ 648	$ 1,667	$ 1,945
Investment expense	(19)	(27)	(55)	(84)
Net investment income	461	621	1,612	1,861
Fixed income securities
Net investment income
Investment income, before expense	349	487	1,179	1,477
Mortgage loans
Net investment income
Investment income, before expense	48	91	188	269
Equity securities
Net investment income
Investment income, before expense	7	3	17	8
Limited partnership interests
Net investment income
Investment income, before expense	51	37	209	104
Short-term investments
Net investment income
Investment income, before expense	0	0	1	1
Policy loans
Net investment income
Investment income, before expense	10	12	30	36
Other
Net investment income
Investment income, before expense	$ 15	$ 18	$ 43	$ 50