Insurance (Obligations Under Funding Agreements - Liability and Collateral) (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
Fixed and Floating Rate Funding Agreements by Type [Line Items]
Outstanding funding agreements to certain SPEs	$ 31,200,000,000	$ 30,000,000,000
Invested Assets Pledged As Collateral	23,770,000,000	23,251,000,000
Funding agreements - Federal Agricultural Mortgage Corporation [Member]
Fixed and Floating Rate Funding Agreements by Type [Line Items]
Outstanding funding agreements to certain SPEs	2,750,000,000	2,750,000,000
Invested Assets Pledged As Collateral	3,159,000,000	3,159,000,000
Federal Home Loan Bank of New York [Member]
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Federal Home Loan Bank amount of advances by branch for funding agreements	12,770,000,000	13,512,000,000
Collateral pledged relating to obligations under funding agreements	14,287,000,000	14,611,000,000
Federal Home Loan Bank of Boston [Member]
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Federal Home Loan Bank amount of advances by branch for funding agreements	450,000,000	450,000,000
Collateral pledged relating to obligations under funding agreements	808,000,000	537,000,000
Federal Home Loan Bank of Des Moines [Member]
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Federal Home Loan Bank amount of advances by branch for funding agreements	1,405,000,000	1,405,000,000
Collateral pledged relating to obligations under funding agreements	1,596,000,000	1,902,000,000
Federal Home Loan Bank of Pittsburgh [Member]
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Federal Home Loan Bank amount of advances by branch for funding agreements	375,000,000	0
Collateral pledged relating to obligations under funding agreements	$ 976,000,000	$ 810,000,000