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Depreciation and Amortization
9 Months Ended
Sep. 30, 2020
Depreciation, Depletion and Amortization [Abstract]  
Depreciation and Amortization DEPRECIATION AND AMORTIZATION
 
    Depreciation and amortization expense, including discontinued operations, was $99 million and $124 million for the nine-month periods ended September 30, 2020 and 2019, respectively.