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Consolidated Statements Of Comprehensive Income (Loss) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 226	$ (1,198)	$ 171
Net cumulative translation adjustments (CTA)[Abstract]
Foreign currency translation adjustments, net of tax	(68)	(71)	(35)
Reclassification adjustment included in net income	4	1	1
Foreign currency translation adjustments, net of tax of $(3), $4 and $27	(64)	(70)	(34)
Actuarial gains (losses), net of tax	71	(96)	(115)
Reclassification adjustment included in net income	39	34	28
Pension and post-retirement benefits, net of taxes of $(22), $10 and $18	110	(62)	(87)
Changes in fair value of derivatives
Changes in fair value of derivatives, net of tax	0	(2)	1
Reclassification adjustment included in net income	1	0	(1)
Changes in fair value of derivatives, net of taxes of $0, $0 and $0	1	(2)	0
Other comprehensive income (loss), net of tax	47	(134)	(121)
Comprehensive income (loss)	273	(1,332)	50
Less: Comprehensive income attributable to noncontrolling interests	(25)	(66)	(105)
Comprehensive income (loss) attributable to KBR	$ 248	$ (1,398)	$ (55)

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