Reinsurance (Narrative) (Details) (USD $)			12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013 Mortality Risk [Member]	Dec. 31, 2013 Mortality Risk on Case by Case Basis [Member]	Dec. 31, 2013 Quota Share Reinsurance for Certain Disability Business [Member]	Dec. 31, 2013 Mortality Risk on Yearly Renewable Term Basis [Member]	Dec. 31, 2013 Modified Coinsurance of Closed Block [Member]	Dec. 31, 2013 Ceded Credit Risk, Unsecured [Member]	Dec. 31, 2012 Ceded Credit Risk, Unsecured [Member]	Dec. 31, 2013 Five Largest Ceded Reinsurers [Member]	Dec. 31, 2012 Five Largest Ceded Reinsurers [Member]	Dec. 31, 2013 Five Largest Ceded Reinsurers [Member] Ceded Credit Risk, Unsecured [Member]	Dec. 31, 2012 Five Largest Ceded Reinsurers [Member] Ceded Credit Risk, Unsecured [Member]
Reinsurance Disclosures [Abstract]
Deposit assets in premiums, reinsurance, and other receivables or secondary guarantee risk for reinsurance	$ 2,300,000,000	$ 2,300,000,000
Deposit liabilities in other liabilities for reinsurance	37,000,000	45,000,000
Ceded Credit Risk [Line Items]
Reinsurance recoverables	14,400,000,000	14,100,000,000						5,600,000,000	5,700,000,000
Five largest reinsurers, reinsurance recoverables amount										10,600,000,000	10,400,000,000	2,600,000,000	2,800,000,000
Five largest reinsurers, reinsurance recoverables percentage										74.00%	74.00%
Reinsurance Retention Policy [Line Items]
Reinsured risk percentage			90.00%		100.00%		59.25%
Percentage of reinsured risk in excess of stated amount			90.00%	100.00%
Retention amount			$ 2,000,000	$ 20,000,000		$ 5,000,000