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Revenue
 6 Months Ended
Jun. 30, 2021
Revenue from Contract with Customer [Abstract]  
Revenue Revenue
Disaggregated Revenue

We disaggregate our revenue from customers by business unit, geographic destination and contract type for each of our segments, as we believe it best depicts how the nature, amount, timing and uncertainty of our revenue and cash flows are affected by economic factors.

Revenue by business unit and reportable segment was as follows:
Three Months EndedSix Months Ended
June 30,June 30,
Dollars in millions2021202020212020
Government Solutions
     Science & Space$261 $241 $508 $478 
     Defense & Intel395 207 746 412 
     Readiness & Sustainment315 269 644 555 
     International260 236 497 490 
Total Government Solutions1,231 953 2,395 1,935 
Sustainable Technology Solutions305 432 602 987 
Total revenue$1,536 $1,385 $2,997 $2,922 

Government Solutions revenue earned from key U.S. government customers includes U.S. DoD and intelligence agencies, NASA, and other federal civilian agencies and is reported as Science & Space, Defense & Intel, and Readiness & Sustainment.  Government Solutions revenue earned from non-U.S. government customers primarily includes the U.K. MoD and the Australian Defence Force and is reported as International.
Revenue by geographic destination was as follows:

Three Months Ended June 30, 2021
Total by Countries/Regions
Dollars in millions
Government SolutionsSustainable Technology SolutionsTotal
     United States$804 $109 $913 
     Middle East143 54 197 
     Europe161 61 222 
     Australia90 — 90 
     Canada— 1 1 
     Africa19 24 43 
     Asia1 51 52 
     Other countries13 5 18 
Total revenue$1,231 $305 $1,536 
Three Months Ended June 30, 2020
Total by Countries/Regions
Dollars in millions
Government SolutionsSustainable Technology SolutionsTotal
     United States$521 $198 $719 
     Middle East171 59 230 
     Europe159 38 197 
     Australia68 11 79 
     Canada— 5 5 
     Africa19 14 33 
     Asia— 56 56 
     Other countries15 51 66 
Total revenue$953 $432 $1,385 
Six Months Ended June 30, 2021
Total by Countries/Regions
Dollars in millions
Government SolutionsSustainable Technology SolutionsTotal
     United States$1,553 $222 $1,775 
     Middle East276 98 374 
     Europe334 105 439 
     Australia167 4 171 
     Canada— 1 1 
     Africa38 44 82 
     Asia1 102 103 
     Other countries26 26 52 
Total revenue$2,395 $602 $2,997 
Six Months Ended June 30, 2020
Total by Countries/Regions
Dollars in millions
Government SolutionsSustainable Technology SolutionsTotal
     United States$1,034 $447 $1,481 
     Middle East358 123 481 
     Europe349 97 446 
     Australia126 40 166 
     Canada— 31 31 
     Africa38 37 75 
     Asia— 124 124 
     Other countries30 88 118 
Total revenue$1,935 $987 $2,922 

Many of our contracts contain cost reimbursable, time-and-materials, and fixed price components. We define contract type based on the component that represents the majority of the contract. Revenue by contract type was as follows:    

Three Months Ended June 30, 2021
Dollars in millionsGovernment SolutionsSustainable Technology SolutionsTotal
     Cost Reimbursable$728 $— $728 
     Time-and-Materials226 187 413 
     Fixed Price277 118 395 
Total revenue$1,231 $305 $1,536 
Three Months Ended June 30, 2020
Dollars in millionsGovernment SolutionsSustainable Technology SolutionsTotal
     Cost Reimbursable$570 $— $570 
     Time-and-Materials140 297 437 
     Fixed Price243 135 378 
Total revenue$953 $432 $1,385 
Six Months Ended June 30, 2021
Dollars in millionsGovernment SolutionsSustainable Technology SolutionsTotal
     Cost Reimbursable$1,417 $— $1,417 
     Time-and-Materials438 377 815 
     Fixed Price540 225 765 
Total revenue$2,395 $602 $2,997 
Six Months Ended June 30, 2020
Dollars in millionsGovernment SolutionsSustainable Technology SolutionsTotal
     Cost Reimbursable$1,153 $— $1,153 
     Time-and-Materials264 701 965 
     Fixed Price518 286 804 
Total revenue$1,935 $987 $2,922 
    
Performance Obligations and Contract Liabilities

We recognized revenue from performance obligations satisfied in previous periods of $9 million for the three months ended June 30, 2020, and $18 million and $37 million for the six months ended June 30, 2021 and 2020, respectively.

On June 30, 2021, we had $11.5 billion of transaction price allocated to remaining performance obligations. We expect to recognize approximately 30% of our remaining performance obligations as revenue within one year, 33% in years two through five, and 37% thereafter. Revenue associated with our remaining performance obligations to be recognized beyond one year includes performance obligations related to the Aspire Defence and Fasttrax projects, which have contract terms extending through 2041 and 2023, respectively. Remaining performance obligations does not include variable consideration that was determined to be constrained as of June 30, 2021.

We recognized revenue of $144 million for the six months ended June 30, 2021, which was previously included in the contract liability balance at December 31, 2020.

Accounts Receivable    
June 30,December 31,
Dollars in millions20212020
     Unbilled$479 $476 
     Trade & other455 423 
Accounts receivable$934 $899