Quarterly Financial Data (unadited) (Asset impairment and MTM gains and losses) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	12 Months Ended
Jan. 03, 2015	Sep. 27, 2014	Jun. 28, 2014	Mar. 29, 2014	Dec. 28, 2013	Sep. 28, 2013	Jun. 29, 2013	Mar. 30, 2013	Jan. 03, 2015	Dec. 28, 2013
Quarterly Financial Data [Abstract]
Asset impairment and exit costs	$ 74	$ 92	$ 78	$ 54	$ 201	$ 29	$ 7	$ 13	$ 298	$ 250
Gain Loss On Mark To Market Adjustments	822k_GainLossOnMarkToMarketAdjustments	66k_GainLossOnMarkToMarketAdjustments	12k_GainLossOnMarkToMarketAdjustments	(116)k_GainLossOnMarkToMarketAdjustments	(1,006)k_GainLossOnMarkToMarketAdjustments	(2)k_GainLossOnMarkToMarketAdjustments	7k_GainLossOnMarkToMarketAdjustments	54k_GainLossOnMarkToMarketAdjustments	784k_GainLossOnMarkToMarketAdjustments	(947)k_GainLossOnMarkToMarketAdjustments
Pre Tax Charges Gains In Operating Profit	$ 896k_PreTaxChargesGainsInOperatingProfit	$ 158k_PreTaxChargesGainsInOperatingProfit	$ 90k_PreTaxChargesGainsInOperatingProfit	$ (62)k_PreTaxChargesGainsInOperatingProfit	$ (805)k_PreTaxChargesGainsInOperatingProfit	$ 27k_PreTaxChargesGainsInOperatingProfit	$ 14k_PreTaxChargesGainsInOperatingProfit	$ 67k_PreTaxChargesGainsInOperatingProfit	$ 1,082k_PreTaxChargesGainsInOperatingProfit	$ (697)k_PreTaxChargesGainsInOperatingProfit

The aggregate amount provided for estimated restructuring charges, remediation costs, and asset impairment loss during an accounting period. Generally, these items are either unusual or infrequent, but not both (in which case they would be extraordinary items).

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.3)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

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Data Type:	xbrli:monetaryItemType
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Period Type:	duration