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Share-based Compensation And Incentive Plans (Narrative) (Details) - USD ($) | 1 Months Ended | 12 Months Ended
--- | --- | ---
May. 31, 2012 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense |  | $ 7,000,000 | $ 8,000,000 | $ 6,000,000
Stock Compensation Plan [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized | 2,000,000 |  |  |
Common stock reserved for issuance | 12,000,000 | 2,300,000 |  |
Employee Stock Purchase Plan [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Percentage of discount on stock price |  | 5.00% |  |
ESPP stock issued (shares) |  | 204,000 | 159,000 |
Maximum withhold percentage |  | 10.00% |  |
Stock Options [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Weighted average grant-date fair value per share |  | $ 4.91 | $ 9.57 |
Total intrinsic values of options exercised |  | $ 300,000 | $ 3,000,000 | 7,000,000
Weighted average recognizing period of unrecognized compensation cost (in years) |  | 1 year 9 months |  |
Stock option compensation expense |  | $ 5,000,000 | 6,000,000 | 9,000,000
Unrecognized compensation cost, net of estimated forfeitures |  | 5,000,000 |  |
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense |  | $ 2,000,000 | $ 2,000,000 | $ 3,000,000
KBR Restricted Stock [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Weighted average grant-date fair value per share |  | $ 16.66 | $ 28.46 | $ 30.64
Weighted average recognizing period of unrecognized compensation cost (in years) |  | 1 year 9 months 26 days |  |
Unrecognized compensation cost, net of estimated forfeitures |  | $ 18,000,000 |  |
Restricted stock compensation expense |  | 13,000,000 | $ 16,000,000 | $ 7,000,000
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense |  | 5,000,000 | 6,000,000 | 3,000,000
Weighted-Average Fair Value On Vesting Date [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total fair value of shares vested based on the weighted-average fair value |  | 9,000,000 | 6,000,000 | 8,000,000
Weighted-Average Fair Value On Grant Date [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total fair value of shares vested based on the weighted-average fair value |  | $ 14,000,000 | $ 11,000,000 | $ 7,000,000
Cash Performance Awards [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Percentage of average total shareholder return |  | 50.00% | 100.00% | 100.00%
Percentage of job income sold |  | 50.00% |  |
Expense for cash performance awards |  | $ 3,000,000 | $ 0 | $ 8,000,000
Liability for awards |  | 5,000,000 | $ 1,000,000 |
Liability for awards due within one year |  | $ 0 |  |
Restricted Stock Units (RSUs) [Member] | Stock Compensation Plan [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized | 2,000,000 |  |  |
Common stock reserved for issuance | 5,500,000 | 700,000 |  |
Cash Performance Awards [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of shares, granted |  | 22,000,000 | 27,000,000 | 30,000,000
Cash performance award units period, years |  | 3 years | 3 years | 3 years
Number of cash performance based award units forfeited |  | 15,000,000 | 17,000,000 | 10,000,000
Outstanding awards balance |  | 70,800,000 |  |

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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition The highest percentage of annual salary that an employee is permitted to utilize with respect to the plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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