Comprehensive Income and Shareholders' Equity (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 29, 2018	Sep. 30, 2017	Sep. 29, 2018	Sep. 30, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	$ 26,445	$ 22,391	$ 25,413	$ 21,540
Cumulative effect of accounting changes			30
Other comprehensive income (loss) before reclassifications			(444)
Amounts reclassified from accumulated other comprehensive items			16
Total other comprehensive items	(28)	73	(428)	453
Balance	26,890	24,702	26,890	24,702
Currency Translation Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance			(1,755)
Cumulative effect of accounting changes			(54)
Other comprehensive income (loss) before reclassifications			(447)
Total other comprehensive items			(447)
Balance	(2,256)		(2,256)
Unrealized Gains on Available-for-Sale Investments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance			(1)
Cumulative effect of accounting changes			1
Total other comprehensive items			0
Balance	0		0
Unrealized Losses on Hedging Instruments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance			(50)
Cumulative effect of accounting changes			(11)
Amounts reclassified from accumulated other comprehensive items			6
Total other comprehensive items			6
Balance	(55)		(55)
Pension and Other Postretirement Benefit Liability Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance			(197)
Cumulative effect of accounting changes			(24)
Other comprehensive income (loss) before reclassifications			3
Amounts reclassified from accumulated other comprehensive items			10
Total other comprehensive items			13
Balance	(208)		(208)
Accumulated Other Comprehensive Items [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	(2,491)	(2,256)	(2,003)	(2,636)
Cumulative effect of accounting changes			(88)
Total other comprehensive items	(28)	73	(428)	453
Balance	$ (2,519)	$ (2,183)	$ (2,519)	$ (2,183)