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Fair Value of Assets and Liabilities (Carrying Values and Fair Value Estimates of Financial Instruments) (Details) - USD ($)
$ in Millions
Sep. 30, 2017
Dec. 31, 2016
Sep. 30, 2016
Dec. 31, 2015
Financial assets        
Mortgage loans $ 3,735 $ 3,938    
Financial liabilities        
Liability for collateral 575 550 $ 501 $ 550
Notes due to related parties 140 465    
Carrying value        
Financial assets        
Mortgage loans 3,735 3,938    
Cost method limited partnerships 617 591    
Bank loans 460 467    
Agent loans 523 467    
Notes due from related party 0 325    
Financial liabilities        
Contractholder funds on investment contracts 10,582 11,276    
Liability for collateral 575 550    
Notes due to related parties 140 465    
Fair value        
Financial assets        
Mortgage loans 3,922 3,963    
Cost method limited partnerships 717 681    
Bank loans 460 467    
Agent loans 520 467    
Notes due from related party 0 325    
Financial liabilities        
Contractholder funds on investment contracts 11,167 11,972    
Liability for collateral 575 550    
Notes due to related parties $ 142 $ 465