Cost of Revenue	9 Months Ended
Sep. 30, 2019
Cost of Revenue [Abstract]
Cost of Revenue Disclosure	3. COST OF REVENUE Substantially all of the Company’s operating costs and expenses are “cost of revenue” items. Operating costs that could be classified as general and administrative by the Company would include the Company’s corporate office costs at its Franklin, Tennessee office, which were $48 million and $46 million for the three months ended September 30, 2019 and 2018, respectively, and $135 million and $141 million for the nine months ended September 30, 2019 and 2018, respectively. Included in these corporate office costs is stock-based compensation of $2 million and $3 million for the three months ended September 30, 2019 and 2018, respectively, and $8 million and $10 million for the nine months ended September 30, 2019 and 2018, respectively.

3. COST OF REVENUE

Substantially all of the Company’s operating costs and expenses are “cost of revenue” items. Operating costs that could be classified as general and administrative by the Company would include the Company’s corporate office costs at its Franklin, Tennessee office, which were $48 million and $46 million for the three months ended September 30, 2019 and 2018, respectively, and $135 million and $141 million for the nine months ended September 30, 2019 and 2018, respectively. Included in these corporate office costs is stock-based compensation of $2 million and $3 million for the three months ended September 30, 2019 and 2018, respectively, and $8 million and $10 million for the nine months ended September 30, 2019 and 2018, respectively.