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Investments - Scheduled maturities for fixed income securities (Details) - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
Amortized cost    
Due in one year or less $ 4,038  
Due after one year through five years 28,963  
Due after five years through ten years 16,216  
Due after ten years 6,944  
Subtotal 56,161  
ABS, RMBS and CMBS 1,457  
Amortized cost 57,618 $ 57,525
Fair value    
Due in one year or less 4,042  
Due after one year through five years 28,812  
Due after five years through ten years 15,987  
Due after ten years 7,263  
Subtotal 56,104  
ABS, RMBS and CMBS 1,559  
Total fixed income securities $ 57,663 $ 58,992