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Revenues - Disaggregation of Revenues (Details) - USD ($)
$ in Millions
12 Months Ended
Jan. 29, 2021
Jan. 31, 2020
Feb. 01, 2019
Disaggregation of Revenue [Line Items]      
Revenues $ 7,056 $ 6,379 $ 4,659
Prime contractor to federal government      
Disaggregation of Revenue [Line Items]      
Revenues 6,337 5,662 4,178
Subcontractor to federal government      
Disaggregation of Revenue [Line Items]      
Revenues 566 588 334
Other      
Disaggregation of Revenue [Line Items]      
Revenues 153 129 147
Cost reimbursement      
Disaggregation of Revenue [Line Items]      
Revenues 3,773 3,644 2,306
Time and materials (T&M)      
Disaggregation of Revenue [Line Items]      
Revenues 1,557 1,280 1,086
Firm-fixed price (FFP)      
Disaggregation of Revenue [Line Items]      
Revenues 1,726 1,455 1,267
Department of Defense      
Disaggregation of Revenue [Line Items]      
Revenues 3,292 3,330 2,805
Other federal government agencies      
Disaggregation of Revenue [Line Items]      
Revenues 3,611 2,920 1,707
Commercial, state and local      
Disaggregation of Revenue [Line Items]      
Revenues $ 153 $ 129 $ 147