Other Financial Data (Earnings Per Common Share) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
Apr. 04, 2015	Mar. 29, 2014
Basic earnings (loss) per common share:
Earnings from continuing operations, net of tax	$ 87	$ 85
Net earnings	74us-gaap_NetIncomeLoss	127us-gaap_NetIncomeLoss
Weighted average common shares outstanding, basic (shares)	215.3	254.1
Continuing operations (US$ per share)	$ 0.40	$ 0.33
Basic earnings per share amount (US$ per share)	$ 0.34us-gaap_EarningsPerShareBasic	$ 0.50us-gaap_EarningsPerShareBasic
Diluted earnings per common share:
Earnings from continuing operations, net of tax	87	85
Net earnings	$ 74us-gaap_NetIncomeLoss	$ 127us-gaap_NetIncomeLoss
Weighted average common shares outstanding, basic (shares)	215.3	254.1
Add effect of dilutive securities:
Share-based awards (in shares)	2.5	4.2
Diluted weighted average common shares outstanding (shares)	217.8	258.3
Continuing operations (US$ per share)	$ 0.40	$ 0.33
Diluted earnings per share amount (US$ per share)	$ 0.34us-gaap_EarningsPerShareDiluted	$ 0.49us-gaap_EarningsPerShareDiluted
Stock Options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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