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Debt And Other Credit Facilities (Details)
£ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2015
USD ($)
Dec. 31, 2015
GBP (£)
Sep. 25, 2015
USD ($)
Dec. 31, 2014
USD ($)
Line of Credit Facility [Line Items]        
Amounts advanced bear interest at variable rates Amounts drawn under the Credit Agreement will bear interest at variable rates, per annum, based either on (i) the London interbank offered rate ("LIBOR") plus an applicable margin of 1.375% to 1.75%, or (ii) a base rate plus an applicable margin of 0.375% to 0.75%, with the base rate equal to the highest of (a) reference bank’s publicly announced base rate, (b) the Federal Funds Rate plus 0.5%, or (c) LIBOR plus 1%. The amount of the applicable margin to be applied will be determined by the Company’s ratio of consolidated debt to consolidated EBITDA for the prior four fiscal quarters, as defined in the Credit Agreement. The Credit Agreement provides for fees on letters of credit issued under the Credit Agreement at a rate equal to the applicable margin for LIBOR-based loans, except for performance letters of credit, which are priced at 50% of such applicable margin. KBR pays an annual issuance fee of 0.125% of the face amount of a letter of credit and pays a commitment fee of 0.225% to 0.25%, per annum, on any unused portion of the commitment under the Credit Agreement based on the Company's consolidated leverage ratio.      
Nonrecourse project debt $ 51     $ 63
Debt To EBITDA Ratio [Member]        
Line of Credit Facility [Line Items]        
Line of credit facility terms 3.5 to 1      
Maximum [Member] | Revolving Credit Facility [Member]        
Line of Credit Facility [Line Items]        
LIBOR applicable margin 1.75%      
AdditionalAggregateCommitmentsIncreaseLimit [Member]        
Line of Credit Facility [Line Items]        
Line of credit facility, maximum borrowing capacity     $ 500  
Revolving Credit Facility [Member]        
Line of Credit Facility [Line Items]        
Line of credit facility, maximum borrowing capacity     $ 1,000  
Percent added to federal fund rate 0.50%      
Percent added to LIBOR 1.00%      
Percentage of LIBOR applicable margin for performance letters of credit 50.00%      
Letter of credit fee charged on issuance 0.125%      
Minimum consolidated net worth base in addition to certain percentage of consolidated net income and increase in shareholders' equity attributable to the sale of equity interests $ 1,200      
Consolidated net income percentage 50.00% 50.00%    
Increase in shareholders' equity attributable to the sale of equity securities percentage 100.00% 100.00%    
Additional amount of equity repurchases allowed under Credit Agreement pending the resolution of PEMEX litigation. $ 400      
Remaining availability under equity repurchase distribution cap $ 698      
Revolving Credit Facility [Member] | Maximum [Member]        
Line of Credit Facility [Line Items]        
Base rate applicable margin 0.75%      
Letter of credit fronting commitments 0.25%      
Principal amount of of additional indebtedness parent company may incur under Credit Agreement provisions $ 200      
Principal amount of unsecured indebtedness our subsidiaries may incur under Credit Agreement provisions 200      
Base dollar amount of share and equity repurchases cap $ 750      
Revolving Credit Facility [Member] | Minimum [Member]        
Line of Credit Facility [Line Items]        
LIBOR applicable margin 1.375%      
Base rate applicable margin 0.375%      
Letter of credit fronting commitments 0.225%      
Letters Of Credit, Surety Bonds And Bank Guarantees [Member]        
Line of Credit Facility [Line Items]        
Letters of credit, outstanding amount $ 593      
LettersOfCreditOutstandingLongerMaturity 0      
Committed and uncommitted lines of credit, total 2,200      
Letters of credit outstanding relate to joint venture operations 236      
Letters Of Credit, Surety Bonds And Bank Guarantees [Member] | Credit Agreement [Member]        
Line of Credit Facility [Line Items]        
Letters of credit, outstanding amount 127      
Letters Of Credit, Surety Bonds And Bank Guarantees [Member] | Uncommitted Bank Lines [Member]        
Line of Credit Facility [Line Items]        
Letters of credit, outstanding amount $ 466      
Nonrecourse Project Finance Debt [Member]        
Line of Credit Facility [Line Items]        
Equity Method Investment, Ownership Percentage 50.00% 50.00%    
Number of heavy equipment transporters 91      
Number of heavy equipment transporters, term period, in years 22 years      
Nonrecourse project debt | £   £ 84.9    
Non-recourse debt bridge financing | £   £ 12.2    
Fasttrax Limited Project [Member] | United States of America, Dollars | Nonrecourse Project Finance Debt [Member]        
Line of Credit Facility [Line Items]        
Nonrecourse project debt $ 120      
Non-recourse debt bridge financing 17      
Class A 3.5% Index Linked Bonds [Member] | United States of America, Dollars        
Line of Credit Facility [Line Items]        
Secured Debt 79      
Class B 5.9% Fixed Rate Bonds [Member] | United States of America, Dollars        
Line of Credit Facility [Line Items]        
Secured Debt $ 24