Significant Accounting Policies (Tables)

3 Months Ended

Mar. 30, 2018

Accounting Policies [Abstract]

Schedule of changes In estimates on contracts

Changes in estimates on contracts for the periods presented were as follows:

	Three Months Ended
	March 30, 2018		March 31, 2017
	(in millions, except per share amounts)
Net favorable impact to income before income taxes	$	35	$	22
Impact on diluted EPS attributable to Leidos common stockholders	$	0.17	$	0.09