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Depreciation and Amortization
9 Months Ended
Sep. 30, 2017
Depreciation, Depletion and Amortization [Abstract]  
Depreciation and Amortization
DEPRECIATION AND AMORTIZATION
 
Depreciation and amortization expense was $95 million and $100 million for the nine-month periods ended September 30, 2017 and 2016, respectively.