Insurance (Obligations Under Funding Agreements - Liability and Collateral) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Fixed and Floating Rate Funding Agreements by Type [Line Items]
Outstanding funding agreements to certain SPEs	$ 30,300	$ 26,000
Invested Assets Pledged As Collateral	20,712	19,555
Funding agreements - Federal Agricultural Mortgage Corporation [Member]
Fixed and Floating Rate Funding Agreements by Type [Line Items]
Outstanding funding agreements to certain SPEs	2,550	2,550
Invested Assets Pledged As Collateral	2,932	2,929
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	12,570	12,770
Collateral pledged relating to obligations under funding agreements	15,255	14,287
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	1,000	1,000
Collateral pledged relating to obligations under funding agreements	$ 1,141	$ 1,118