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Fair Value of Assets and Liabilities - Carrying values and fair value estimates of financial instruments not carried at fair value (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Dec. 31, 2018
Sep. 30, 2018
Dec. 31, 2017
Financial assets        
Mortgage loans $ 4,694 $ 4,670    
Financial liabilities        
Long-term debt 6,630 6,451    
Liability for collateral 2,087 1,458 $ 1,403 $ 1,124
Significant unobservable inputs (Level 3) | Carrying value        
Financial assets        
Mortgage loans 4,694 4,670    
Bank loans 1,223 1,350    
Agent loans 663 620    
Financial liabilities        
Contractholder funds on investment contracts 8,619 9,250    
Significant unobservable inputs (Level 3) | Fair value        
Financial assets        
Mortgage loans 4,876 4,703    
Bank loans 1,199 1,298    
Agent loans 666 617    
Financial liabilities        
Contractholder funds on investment contracts 9,435 9,665    
Significant other observable inputs (Level 2) | Carrying value        
Financial liabilities        
Long-term debt 6,630 6,451    
Liability for collateral 2,087 1,458    
Significant other observable inputs (Level 2) | Fair value        
Financial liabilities        
Long-term debt 7,710 6,708    
Liability for collateral $ 2,087 $ 1,458