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Impact on Previously Issued Financial Statements for the Correction of an Error (Statement of Operations) (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Error Corrections and Prior Period Adjustments Restatement [Line Items]                      
Equity in earnings of unconsolidated affiliates $ 11 $ 9 $ 15 $ 0 $ 29 $ 17 $ 12 $ 21 $ 35 $ 79 $ 70
Operating income 88 104 92 78 90 99 100 179 362 468 264
Net income 59 58 50 42 53 56 64 137 209 310 440
Net income attributable to KBR $ 58 $ 56 $ 48 $ 40 $ 47 $ 54 $ 44 $ 136 $ 202 $ 281 $ 432
Net income attributable to KBR per share:                      
Basic (usd per share) $ 0.41 $ 0.39 $ 0.34 $ 0.28 $ 0.33 $ 0.38 $ 0.31 $ 0.96 $ 1.42 $ 1.99 $ 3.05
Diluted (usd per share) $ 0.40 $ 0.39 $ 0.34 $ 0.28 $ 0.33 $ 0.38 $ 0.31 $ 0.96 $ 1.41 $ 1.99 $ 3.05
As Previously Reported                      
Error Corrections and Prior Period Adjustments Restatement [Line Items]                      
Equity in earnings of unconsolidated affiliates         $ 27            
Operating income         88            
Net income         49            
Net income attributable to KBR         $ 43            
Net income attributable to KBR per share:                      
Basic (usd per share)         $ 0.31            
Diluted (usd per share)         $ 0.31            
Adjustments                      
Error Corrections and Prior Period Adjustments Restatement [Line Items]                      
Equity in earnings of unconsolidated affiliates         $ 2            
Operating income         2            
Net income         4            
Net income attributable to KBR         $ 4            
Net income attributable to KBR per share:                      
Basic (usd per share)         $ 0.02            
Diluted (usd per share)         $ 0.02