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Revenue (Tables)
12 Months Ended
Dec. 31, 2020
Revenue from Contract with Customer [Abstract]  
Revenue, Remaining Performance Obligation Remaining performance obligations as of December 31, 2020 and December 31, 2019 are presented in the following table:
 Year Ended December 31,
(In millions)20202019
Performance Obligations$993 $849 
Disaggregation of Revenue
The following tables present our revenue disaggregated by different categories. Revenue by contract type for the years 2020, 2019 and 2018 are as follows:
Year Ended December 31,
(In thousands)202020192018
Cost-plus and cost-reimbursable ¹$991,535 $1,048,015 $995,415 
Firm-fixed-price403,994 334,510 283,621 
Total revenue$1,395,529 $1,382,525 $1,279,036 
¹ Includes time and material contracts
Revenue by geographic region in which the contract is performed for the years 2020, 2019 and 2018 are as follows:
Year Ended December 31,
(In thousands)202020192018
Middle East$906,470 $939,685 $889,620 
United States334,128 304,925 269,482 
Europe154,931 137,915 119,934 
Total revenue$1,395,529 $1,382,525 $1,279,036 
Revenue by contract relationship for the years 2020, 2019 and 2018 are as follows:
Year Ended December 31,
(In thousands)202020192018
Prime contractor$1,324,628 $1,312,928 $1,200,726 
Subcontractor70,901 69,597 78,310 
Total revenue$1,395,529 $1,382,525 $1,279,036 
Revenue by customer for the years 2020, 2019 and 2018 are as follows:
Year Ended December 31,
(In thousands)202020192018
Army$965,558 $958,582 $934,427 
Air Force299,272 306,767 259,511 
Navy68,748 56,236 38,534 
Other61,951 60,940 46,564 
Total revenue$1,395,529 $1,382,525 $1,279,036