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Legal Proceedings and Commitments and Contingencies (Details) - USD ($)
1 Months Ended 3 Months Ended 12 Months Ended
May 04, 2015
Sep. 30, 2016
Aug. 31, 2015
May 03, 2019
Jan. 29, 2021
Jan. 31, 2020
Feb. 01, 2019
Commitments And Contingencies [Line Items]              
Payments to acquire businesses, net of cash acquired         $ 1,202,000,000 $ 0 $ 1,001,000,000
Government Investigations and Reviews              
Commitments And Contingencies [Line Items]              
Estimated net amounts to be refunded for potential adjustments         46,000,000    
Letters of Credit              
Commitments And Contingencies [Line Items]              
Outstanding obligations         10,000,000    
Surety Bonds              
Commitments And Contingencies [Line Items]              
Outstanding obligations         $ 18,000,000    
Scitor Holdings, Inc.              
Commitments And Contingencies [Line Items]              
Payments to acquire businesses, net of cash acquired $ 764,000,000            
Business combination amount deposited to adjustment and indemnification escrow accounts included in cash consideration paid $ 43,000,000            
Business combination amount deposited to adjustment and indemnification escrow accounts amounts released   $ 13,000,000 $ 3,000,000        
Business combination, escrow deposit disbursements received       $ 6,000,000      
Escrow deposit       $ 0