Statutory Financial Information (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Statutory Accounting Practices [Line Items]
Dividends available to be paid	$ 3,800,000,000
Statutory capital and surplus	25,600,000,000	24,400,000,000
Statutory net income	3,700,000,000	2,900,000,000	1,900,000,000
Approximate increase in statutory capital and surplus resulting from discount of certain A&E liabilities	158,000,000	161,000,000
Statutory Accounting Practices, Statutory Capital and Surplus Required	$ 14,500,000,000	$ 14,300,000,000