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Revenue
 12 Months Ended
Dec. 31, 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. See details in the tables below.

Revenue by business unit and reportable segment was as follows:

Year Ended December 31,
Dollars in millions202120202019
     Government Solutions
          Science & Space$1,018 $967 $863 
          Defense & Intel 1,475 959 782 
          Readiness & Sustainment2,644 1,153 1,400 
          International1,012 976 997 
     Total Government Solutions6,149 4,055 4,042 
     Sustainable Technology Solutions1,190 1,712 1,597 
Total revenue$7,339 $5,767 $5,639 

Government Solutions revenue earned from key U.S. government customers includes U.S. DoD agencies and NASA, and is reported as Science & Space Solutions, Defense & Intel, Readiness & Sustainment and International. 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:

Year Ended December 31, 2021

Dollars in millions
Government SolutionsSustainable Technology SolutionsTotal
     United States$4,493 $430 $4,923 
     Middle East393 197 590 
     Europe816 223 1,039 
     Australia351 16 367 
     Canada1 2 3 
     Africa87 92 179 
     Asia7 192 199 
     Other countries1 38 39 
Total revenue$6,149 $1,190 $7,339 
Year Ended December 31, 2020

Dollars in millions
Government SolutionsSustainable Technology SolutionsTotal
     United States$2,280 $751 $3,031 
     Middle East622 (a) (b)235 857 
     Europe743 218 961 
     Australia272 52 324 
     Canada1 45 46 
     Africa81 71 152 
     Asia— 203 203 
     Other countries56 137 193 
Total revenue$4,055 $1,712 $5,767 

Year Ended December 31, 2019

Dollars in millions
Government SolutionsSustainable Technology SolutionsTotal
     United States$2,110 $595 $2,705 
     Middle East795 (a) (b)232 1,027 
     Europe796 262 1,058 
     Australia209 79 288 
     Canada1 38 39 
     Africa76 121 197 
     Asia— 214 214 
     Other countries55 56 111 
Total revenue$4,042 $1,597 $5,639 

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

Year Ended December 31, 2021
Dollars in millionsGovernment SolutionsSustainable Technology SolutionsTotal
Cost Reimbursable$4,175 $— $4,175 
Time-and-Materials903 739 $1,642 
Fixed Price1,071 451 $1,522 
Total revenue$6,149 $1,190 $7,339 

Year Ended December 31, 2020
Dollars in millionsGovernment SolutionsSustainable Technology SolutionsTotal
Cost Reimbursable$2,409 $— $2,409 
Time-and-Materials608 1,215 1,823 
Fixed Price1,038 497 1,535 
Total revenue$4,055 $1,712 $5,767 
Year Ended December 31, 2019
Dollars in millionsGovernment SolutionsSustainable Technology SolutionsTotal
Cost Reimbursable$2,501 $— $2,501 
Time-and-Materials452 1,077 1,529 
Fixed Price1,089 520 1,609 
Total revenue$4,042 $1,597 $5,639 

Performance Obligations

We recognized revenue of $19 million, $49 million and $15 million from performance obligations satisfied in previous periods for the years ended December 31, 2021, 2020 and 2019, respectively.

On December 31, 2021, we had $11.7 billion of transaction price allocated to remaining performance obligations. We expect to recognize approximately 31% of our remaining performance obligations as revenue within one year, 34% in years two through five and 35% thereafter. Revenue associated with our remaining performance obligations to be recognized beyond one year includes performance obligations related to Aspire Defence and Fasttrax projects, which have contract terms extending through 2041 and 2023, respectively. Remaining performance obligations do not include variable consideration that was determined to be constrained as of December 31, 2021.

Contract Assets and Contract Liabilities

Contract assets were $224 million and $178 million and contract liabilities were $313 million and $356 million, at December 31, 2021 and 2020, respectively. The increase in contract assets was primarily attributed to revenue recognized on certain contracts partially offset by the timing of billings. The decrease in contract liabilities was due to the timing of advance payments and revenue recognized during the period. We recognized revenue of $194 million for the year ended December 31, 2021, which was previously included in the contract liability balance at December 31, 2020.

Accounts Receivable

December 31,
Dollars in millions20212020
     Unbilled$698 $476 
     Trade & other713 423 
Accounts receivable, net$1,411 $899