Investments (Details 4) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Realized capital gains and losses by asset type
Realized capital gains and losses	$ 240	$ 362	$ 294	$ 493
Fixed income securities
Realized capital gains and losses by asset type
Realized capital gains and losses	62	79	98	151
Equity securities
Realized capital gains and losses by asset type
Realized capital gains and losses	239	283	261	312
Mortgage loans
Realized capital gains and losses by asset type
Realized capital gains and losses	(2)	(6)	1	25
Limited partnership interests
Realized capital gains and losses by asset type
Realized capital gains and losses	(51)	(8)	(49)	(3)
Derivatives
Realized capital gains and losses by asset type
Realized capital gains and losses	(7)	14	(19)	10
Other
Realized capital gains and losses by asset type
Realized capital gains and losses	$ (1)		$ 2	$ (2)