Financial Instruments - Fair Value of Derivative Financial Instruments and Related Notional Amounts (Details) - USD ($) $ in Millions		Sep. 29, 2019	Dec. 31, 2018
Derivative [Line Items]
Asset		$ 1,542	$ 1,140
Liability		733	1,024
Derivatives designated as hedging instruments [Member]
Derivative [Line Items]
Asset		1,425	1,085
Liability		621	968
Derivatives designated as hedging instruments [Member] | Foreign exchange contracts [Member]
Derivative [Line Items]
Notional	[1]	22,807	22,984
Asset	[1]	810	654
Liability	[1]	621	586
Derivatives designated as hedging instruments [Member] | Interest rate contracts [Member]
Derivative [Line Items]
Notional		6,645	11,145
Asset		616	432
Liability		0	383
Derivatives not designated as hedging instruments [Member] | Foreign exchange contracts [Member]
Derivative [Line Items]
Notional		18,112	15,154
Asset		116	55
Liability		112	55
Inventory sales [Member] | Derivatives designated as hedging instruments [Member] | Foreign exchange contracts [Member]
Derivative [Line Items]
Notional	[1]	$ 6,600	$ 5,800

[1] The notional amount of outstanding foreign currency forward-exchange contracts hedging our intercompany forecasted inventory sales was $6.6 billion as of September 29, 2019 and $5.8 billion as of December 31, 2018.