Stock Compensation Summary of restricted stock activity (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
Jan. 02, 2016	Jan. 03, 2015	Dec. 28, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted - shares		202,000	185,000
Non-vested, beginning of year - weighted-average grant-date fair value	$ 54	$ 54
Non-vested, end of year - weighted-average grant-date fair value		$ 54	$ 54
Restricted Stock and Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Non-vested, beginning of year - shares	346,000	318,000	316,000
Granted - shares	617,000	114,000	139,000
Vested - shares	(113,000)	(65,000)	(117,000)
Forfeited - shares	(44,000)	(21,000)	(20,000)
Non-vested, end of year - shares	806,000	346,000	318,000
Non-vested, beginning of year - weighted-average grant-date fair value	$ 54	$ 52	$ 50
Granted - weighted average grant-date fair value	59	56	52
Vested - weighted-average grant-date fair value	50	51	51
Forfeited - weighted-average grant-date fair value	58	53	47
Non-vested, end of year - weighted-average grant-date fair value	$ 57	$ 54	$ 52
Vesting period, years	3 years
Total fair value of restricted stock and restricted stock units vested during period	$ 7	$ 4	$ 6

Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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