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Insurance (Obligations Under Funding Agreements - Liability and Collateral) (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]    
Outstanding Funding Agreements To Certain SPEs $ 34,600 $ 32,300
Funding Agreements Farmer Mac    
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]    
Outstanding Funding Agreements To Certain SPEs 2,550 2,550
Invested Assets Pledged As Collateral 2,670 2,639
Federal Home Loan Bank of New York    
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]    
Federal Home Loan Bank amount of advances by branch for funding agreements 14,445 14,245
Collateral pledged relating to obligations under funding agreements 16,570 16,557
Federal Home Loan Bank of Des Moines    
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]    
Federal Home Loan Bank amount of advances by branch for funding agreements 100 425
Collateral pledged relating to obligations under funding agreements 141 709
Federal Home Loan Bank of Pittsburgh    
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]    
Federal Home Loan Bank amount of advances by branch for funding agreements 775 450
Collateral pledged relating to obligations under funding agreements $ 895 $ 590