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Restricted Investments - Contractual Maturities of Our Held-to-Maturity Restricted Investments (Details)
$ in Millions
Sep. 30, 2016
USD ($)
Amortized Cost  
Due in one year or less $ 115
Due after one year through five years 1
Amortized Cost, Total 116
Estimated Fair Value  
Due in one year or less 115
Due after one year through five years 1
Estimated Fair Value, Total $ 116