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Revenue from Contracts with Customers (Tables)
 12 Months Ended
Dec. 31, 2021
Revenue from Contract with Customer [Abstract]  
Schedule of Change in Estimate at Completion Adjustments
EAC adjustments had the following impacts to revenue for the periods presented:
Year Ended December 31,
(Dollars in millions)202120202019
Revenue$(34)$(77)$(55)
Total % of Revenue1 %3 %2 %
Schedule of Contract Assets and Contract Liabilities
Year Ended December 31,
(Dollars in millions)20212020
Contract assets$743 $672 
Contract liabilities174 177 
Net contract assets
$569 $495 
Schedule of Remaining Performance Obligations, Expected Timing of Satisfaction
The following table summarizes the value of our backlog at December 31, 2021 and 2020:
Backlog:Year Ended December 31,
(Dollars in millions)20212020
Funded$2,510 $2,847 
Unfunded351 444 
Total Backlog
$2,861 $3,291 
Schedule of Disaggregation of Revenue We believe these categories best depict how the nature, amount, timing and uncertainty of AST revenue and cash flows are affected by economic factors:
Year Ended December 31,
(Dollars in millions)202120202019
Revenue by Geographical Region
United States$880 $821 $711 
International76 107 58 
Intersegment Sales14 12 12 
Total
$970 $940 $781 
Revenue by Customer Relationship
Prime contractor$505 $443 $372 
Subcontractor451 485 397 
Intersegment Sales14 12 12 
Total
$970 $940 $781 
Revenue by Contract Type
Firm Fixed Price
$822 $813 $614 
Flexibly Priced(1)
134 115 155 
Intersegment Sales14 12 12 
Total
$970 $940 $781 
________________
(1)Includes revenue derived from time-and-materials contracts.
We believe these categories best depict how the nature, amount, timing and uncertainty of NC&C revenue and cash flows are affected by economic factors:
Year Ended December 31,
(Dollars in millions)202120202019
Revenue by Geographical Region
United States$928 $942 $988 
International37 75 41 
Intersegment Sales7 9 24 
Total
$972 $1,026 $1,053 
Revenue by Customer Relationship
Prime contractor$704 $620 $655 
Subcontractor261 397 374 
Intersegment Sales7 9 24 
Total
$972 $1,026 $1,053 
Revenue by Contract Type
Firm Fixed Price
$845 $903 $956 
Flexibly Priced(1)
120 114 73 
Intersegment Sales7 9 24 
Total
$972 $1,026 $1,053 
________________
(1)Includes revenue derived from time-and-materials contracts.
We believe these categories best depict
how the nature, amount, timing and uncertainty of IMS revenue and cash flows are affected by economic factors:
Year Ended December 31,
(Dollars in millions)202120202019
Revenue by Geographical Region
United States$913 $792 $895 
International45 41 21 
Intersegment Sales1 1 1 
Total
$959 $834 $917 
Revenue by Customer Relationship
Prime contractor$174 $283 $442 
Subcontractor784 550 474 
Intersegment Sales1 1 1 
Total
$959 $834 $917 
Revenue by Contract Type
Firm Fixed Price
$831 $692 $763 
Flexibly Priced(1)
127 141 153 
Intersegment Sales1 1 1 
Total
$959 $834 $917 
________________
(1)Includes revenue derived from time-and-materials contracts.