Income Taxes (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
Apr. 04, 2015	Mar. 29, 2014
Income Tax Disclosure [Abstract]
Earnings before income taxes	$ 128	$ 89
Income tax expense	40us-gaap_IncomeTaxExpenseBenefit	4us-gaap_IncomeTaxExpenseBenefit
Effective tax rate	31.00%	4.00%
Federal income tax rate	35.00%	35.00%
Unrecognized tax benefits	$ 30

Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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-Publisher FASB

-Name Accounting Standards Codification

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Sum of operating profit and nonoperating income or expense before Income or Loss from equity method investments, income taxes, extraordinary items, and noncontrolling interest.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.4-08.(h))

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-Glossary Income Tax Expense (or Benefit)

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The net amount of all increases and decreases in unrecognized tax benefits for the period.

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