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Fair Value of Assets and Liabilities (Carrying Values and Fair Value Estimates of Financial Instruments) (Details) - USD ($)
$ in Millions
Jun. 30, 2017
Dec. 31, 2016
Jun. 30, 2016
Dec. 31, 2015
Financial assets        
Mortgage loans $ 3,793 $ 3,938    
Financial liabilities        
Liability for collateral 529 550 $ 595 $ 550
Notes due to related parties 140 465    
Carrying value        
Financial assets        
Mortgage loans 3,793 3,938    
Cost method limited partnerships 583 591    
Bank loans 478 467    
Agent loans 499 467    
Notes due from related party 0 325    
Financial liabilities        
Contractholder funds on investment contracts 10,810 11,276    
Liability for collateral 529 550    
Notes due to related parties 140 465    
Fair value        
Financial assets        
Mortgage loans 3,920 3,963    
Cost method limited partnerships 683 681    
Bank loans 479 467    
Agent loans 495 467    
Notes due from related party 0 325    
Financial liabilities        
Contractholder funds on investment contracts 11,405 11,972    
Liability for collateral 529 550    
Notes due to related parties $ 143 $ 465