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Fair Value of Assets and Liabilities - Financial assets (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Financial assets        
Mortgage loans $ 3,876 $ 3,938    
Financial liabilities        
Liability for collateral 542 550 $ 550 $ 510
Notes due to related parties 140 465    
Carrying value        
Financial assets        
Mortgage loans 3,876 3,938    
Cost method limited partnerships 611 591    
Bank loans 437 467    
Agent loans 538 467    
Notes due from related party 0 325    
Financial liabilities        
Contractholder funds on investment contracts 10,331 11,276    
Liability for collateral 542 550    
Notes due to related parties 140 465    
Fair value        
Financial assets        
Mortgage loans 4,052 3,963    
Cost method limited partnerships 713 681    
Bank loans 437 467    
Agent loans 536 467    
Notes due from related party 0 325    
Financial liabilities        
Contractholder funds on investment contracts 11,036 11,972    
Liability for collateral 542 550    
Notes due to related parties $ 141 $ 465