Additional Information (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Additional Information (Textual) [Abstract]
Charges for possible losses on reinsurance recoverables (are less than in 2011 and 2012)	$ 1	$ 1	$ 1
Aggregate allowance for losses on reinsurance recoverables	27	26
Total rental expense	57	51	54
Operating lease future minimum payments due in 2014	57
Operating lease future minimum payments due in 2015	50
Operating lease future minimum payments due in 2016	44
Operating lease future minimum payments due in 2017	35
Operating lease future minimum payments due in 2018	30
Operating lease future minimum payments due after five years	173
Commitments to fund limited partnerships	280
Retirement and employee savings plan expense	$ 32	$ 27	$ 26