Investments (Activity related to the pretax fixed maturity credit loss component reflected within retained earnings for securities still held for which a portion of an OTTI loss was recognized in OCI) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward]
Beginning balance of credit losses on fixed maturity securities	$ 62	$ 74
Reductions for securities sold during the period	(1)	(2)
Reductions for securities the Company intends to sell or more likely than not will be required to sell	0	(3)
Ending balance of credit losses on fixed maturity securities	$ 61	$ 69