Income Taxes	9 Months Ended
Sep. 25, 2015
Income Tax Disclosure [Abstract]
Income Taxes	10. Income Taxes The Company and its subsidiaries file income tax returns in the U.S. Federal jurisdiction and various state and foreign jurisdictions. As of September 25, 2015, the statutes of limitations for the Company’s U.S. Federal income tax returns for the years ended December 31, 2010 through 2014 were open. In the second quarter of 2015, the Company reached agreements relating to the audit of the Company’s 2010 and 2011 U.S. Federal income tax returns with the U.S. Internal Revenue Service (IRS), as well as audits of several state and foreign jurisdictions. As a result of these agreements, the Company reversed previously accrued income tax expense of $10 million, including interest and penalties. The IRS commenced an audit of the Company’s U.S. Federal income tax return for 2012. The Company cannot predict the outcome of the audit at this time. The effective income tax rate for the year-to-date period ended September 25, 2015 is not meaningful because income tax expense was greater than pre-tax income during the period due to the goodwill impairment charge. The marginal income tax rate on the goodwill impairment charge relating to the NSS segment was 6% because a significant portion of the NSS goodwill is not deductible for tax. Excluding the goodwill impairment charge and related income tax benefit, the effective income tax rate for the year-to-date period ended September 25, 2015 would have decreased to 22.3%, compared to 29.5% for the same period last year primarily due to $36 million of tax benefits recorded in the quarterly period ended June 26, 2015, including: (1) $17 million of foreign tax benefits related to a legal restructuring of the Company’s foreign entities, (2) a $10 million benefit related to the resolution of various outstanding income tax matters with U.S. and foreign tax authorities, as discussed above, and (3) $9 million related to deferred tax benefits. As of September 25, 2015, the Company anticipates that unrecognized tax benefits will decrease by approximately $25 million over the next 12 months due to the potential resolution of unrecognized tax benefits involving several jurisdictions and tax periods. The actual amount of the decrease over the next 12 months could vary significantly depending on the ultimate timing and nature of any settlements. Non-current income taxes payable include accrued potential interest of $18 million ($11 million after income taxes) at September 25, 2015 and $15 million ($9 million after income taxes) at December 31, 2014, and potential penalties of $9 million at September 25, 2015 and December 31, 2014.

10. Income Taxes

The Company and its subsidiaries file income tax returns in the U.S. Federal jurisdiction and various state and foreign jurisdictions. As of September 25, 2015, the statutes of limitations for the Company’s U.S. Federal income tax returns for the years ended December 31, 2010 through 2014 were open. In the second quarter of 2015, the Company reached agreements relating to the audit of the Company’s 2010 and 2011 U.S. Federal income tax returns with the U.S. Internal Revenue Service (IRS), as well as audits of several state and foreign jurisdictions. As a result of these agreements, the Company reversed previously accrued income tax expense of $10 million, including interest and penalties. The IRS commenced an audit of the Company’s U.S. Federal income tax return for 2012. The Company cannot predict the outcome of the audit at this time.

The effective income tax rate for the year-to-date period ended September 25, 2015 is not meaningful because income tax expense was greater than pre-tax income during the period due to the goodwill impairment charge. The marginal income tax rate on the goodwill impairment charge relating to the NSS segment was 6% because a significant portion of the NSS goodwill is not deductible for tax. Excluding the goodwill impairment charge and related income tax benefit, the effective income tax rate for the year-to-date period ended September 25, 2015 would have decreased to 22.3%, compared to 29.5% for the same period last year primarily due to $36 million of tax benefits recorded in the quarterly period ended June 26, 2015, including: (1) $17 million of foreign tax benefits related to a legal restructuring of the Company’s foreign entities, (2) a $10 million benefit related to the resolution of various outstanding income tax matters with U.S. and foreign tax authorities, as discussed above, and (3) $9 million related to deferred tax benefits. As of September 25, 2015, the Company anticipates that unrecognized tax benefits will decrease by approximately $25 million over the next 12 months due to the potential resolution of unrecognized tax benefits involving several jurisdictions and tax periods. The actual amount of the decrease over the next 12 months could vary significantly depending on the ultimate timing and nature of any settlements.

Non-current income taxes payable include accrued potential interest of $18 million ($11 million after income taxes) at September 25, 2015 and $15 million ($9 million after income taxes) at December 31, 2014, and potential penalties of $9 million at September 25, 2015 and December 31, 2014.