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Other Financial Information
 12 Months Ended
Dec. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Other Financial Information Other Financial Information
Other Current Assets

The following table presents details of other current assets in our consolidated balance sheets:
 As of December 31,
 20202019
 (Dollars in millions)
Prepaid expenses$290 274 
Income tax receivable7 35 
Materials, supplies and inventory105 105 
Contract assets66 42 
Contract acquisition costs173 178 
Contract fulfillment costs114 115 
Other53 70 
Total other current assets$808 819 

Included in accounts payable at December 31, 2020 and 2019 were $329 million and $469 million, respectively, associated with capital expenditures. Also included in accounts payable at December 31, 2019 was $106 million representing book overdrafts. There were no book overdrafts at December 31, 2020.