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Investments - Contractual Maturities (Details) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Amortized Cost    
Due in one year or less $ 930  
Due after one year through five years 806  
Due after five years through ten years 25  
Amortized Cost 1,761 $ 1,808
Estimated Fair Value    
Due in one year or less 930  
Due after one year through five years 803  
Due after five years through ten years 25  
Estimated Fair Value $ 1,758