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Shareholders' Equity - Changes in AOCI (Details) - USD ($) $ in Millions	6 Months Ended
	Jul. 01, 2018	Jul. 02, 2017
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance	$ (2,820)	$ (3,387)
Cumulative effect adjustments	(638)
Other comprehensive income (loss) pretax	(73)	568
Provision for income tax, net	(27)	(103)
Other comprehensive income (loss) net of tax	(100)	465
Ending Balance	(3,558)	(2,922)
Losses on Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance	(94)	(345)
Cumulative effect adjustments	(4)
Other comprehensive income (loss) pretax	(21)	148
Provision for income tax, net	7	(39)
Other comprehensive income (loss) net of tax	(14)	109
Ending Balance	(112)	(236)
Unrealized Gains on Securities
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance	19	14
Cumulative effect adjustments	(19)
Other comprehensive income (loss) pretax	0	7
Provision for income tax, net	0	(2)
Other comprehensive income (loss) net of tax	0	5
Ending Balance	0	19
Foreign Currency Translation Adjustments
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance	402	69
Cumulative effect adjustments	0
Other comprehensive income (loss) pretax	(215)	281
Provision for income tax, net	0	(15)
Other comprehensive income (loss) net of tax	(215)	266
Ending Balance	187	335
Changes in Retirement Plans’ Funded Status
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance	(3,147)	(3,125)
Cumulative effect adjustments	(615)
Other comprehensive income (loss) pretax	163	132
Provision for income tax, net	(34)	(47)
Other comprehensive income (loss) net of tax	129	85
Ending Balance	$ (3,633)	$ (3,040)

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Accumulated Other Comprehensive Income (Loss) [Roll Forward]

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Tax Cuts and Jobs Act of 2017, Reclassification from AOCI to Retained Earnings

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Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
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Amount before tax of other comprehensive income (loss) attributable to parent entity.

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Amount after tax of other comprehensive income (loss) attributable to parent entity.

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