Financial Instruments - Derivative Financial Instruments and Hedging Activities (Details) - USD ($) $ in Millions		3 Months Ended				9 Months Ended
		Sep. 27, 2020		Sep. 29, 2019		Sep. 27, 2020		Sep. 29, 2019
Derivative [Line Items]
Amount of Gains/(Losses) Recognized in OCI		$ (372)		$ 150		$ (661)		$ 241
All other, net - Amount of Gains/(Losses) Recognized in OCI	[1],[2],[3]	0		(1)		12		0
Amount of Gains/(Losses) Recognized in OCI	[2]	(692)	[1]	429	[1]	(553)	[1]	617
Amount of Gains/(Losses) Reclassified from OCI into OID and COS	[4]	(143)		29		25		372
OID [Member]
Derivative [Line Items]
Amount of Gains/(Losses) Recognized in OID	[2]	255		(77)		205		(201)
Other (Income) Deductions And Cost Of Sales [Member]
Derivative [Line Items]
Amount of Gains/(Losses) Reclassified from OCI into OID and COS	[2],[3]	0		0		(1)		0
Amount of Gains/(Losses) Reclassified from OCI into OID and COS	[2]	(104)		74		147		472
Designated as Hedging Instrument [Member] | Foreign exchange contracts [Member]
Derivative [Line Items]
Amount of Gains/(Losses) Recognized in OCI	[1],[2],[5]	(379)		131		(721)		137
Amount of Gains/(Losses) Recognized in OCI	[1],[2]	(257)		112		(17)		87
Designated as Hedging Instrument [Member] | Foreign currency short-term borrowings [Member]
Derivative [Line Items]
Amount of Gains/(Losses) Recognized in OCI	[1],[2],[6]	0		45		8		65
Designated as Hedging Instrument [Member] | Foreign currency long-term debt [Member]
Derivative [Line Items]
Amount of Gains/(Losses) Recognized in OCI	[1],[2],[6]	(72)		79		(69)		89
Designated as Hedging Instrument [Member] | OID [Member] | Interest rate contracts [Member]
Derivative [Line Items]
Amount of Gains/(Losses) Recognized in OID	[2]	(9)		378		383		1,191
Hedged item	[2]	9		(378)		(383)		(1,191)
Designated as Hedging Instrument [Member] | Other (Income) Deductions And Cost Of Sales [Member] | Foreign exchange contracts [Member]
Derivative [Line Items]
Amount of Gains/(Losses) Reclassified from OCI into OID and COS	[2],[5]	(149)		7		(23)		265
Amount of Gains/(Losses) Reclassified from OCI into OID and COS	[2]	0		0		0		0
Designated as Hedging Instrument [Member] | Other (Income) Deductions And Cost Of Sales [Member] | Foreign currency short-term borrowings [Member]
Derivative [Line Items]
Amount of Gains/(Losses) Reclassified from OCI into OID and COS	[2],[6]	0		0		0		0
Designated as Hedging Instrument [Member] | Other (Income) Deductions And Cost Of Sales [Member] | Foreign currency long-term debt [Member]
Derivative [Line Items]
Amount of Gains/(Losses) Reclassified from OCI into OID and COS	[2],[6]	0		0		0		0
Derivative Financial Instruments Not Designated as Hedges [Member] | OID [Member] | Foreign exchange contracts [Member]
Derivative [Line Items]
Amount of Gains/(Losses) Recognized in OID	[2]	255		(77)		205		(201)
Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member] | Foreign exchange contracts [Member]
Derivative [Line Items]
Amount excluded from effectiveness testing	[1],[2],[3]	7		21		49		105
Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member] | Other (Income) Deductions And Cost Of Sales [Member] | Foreign exchange contracts [Member]
Derivative [Line Items]
Amount excluded from effectiveness testing	[2],[3]	7		22		48		108
Net Investment Hedging [Member] | Designated as Hedging Instrument [Member] | Foreign exchange contracts [Member]
Derivative [Line Items]
Amount excluded from effectiveness testing	[1],[2],[3]	9		43		185		136
Net Investment Hedging [Member] | Designated as Hedging Instrument [Member] | Other (Income) Deductions And Cost Of Sales [Member] | Foreign exchange contracts [Member]
Derivative [Line Items]
Amount excluded from effectiveness testing	[2],[3]	$ 38		$ 45		$ 122		$ 99

[1] For derivative financial instruments in net investment hedge relationships and for foreign currency debt designated as hedging instruments, the gains and losses are included in Other comprehensive income/(loss)––Foreign currency translation adjustments, net.

[2] OID = Other (income)/deductions—net, included in Other (income)/deductions—net in the condensed consolidated statements of income. COS = Cost of Sales, included in Cost of sales in the condensed consolidated statements of income. OCI = Other comprehensive income/(loss), included in the condensed consolidated statements of comprehensive income.

[3] The amounts reclassified from OCI were reclassified into OID.

[4] Reclassified into Other (income)/deductions—net and Cost of sales in the condensed consolidated statements of income. See Note 7E.

[5] The amounts reclassified from OCI into COS were: •a net gain of $34 million in the third quarter of 2020; •a net gain of $184 million in the first nine months of 2020; •a net gain of $66 million in the third quarter of 2019; and •a net gain of $169 million in the first nine months of 2019. The remaining amounts were reclassified from OCI into OID. Based on quarter-end foreign exchange rates that are subject to change, we expect to reclassify a pre-tax loss of $192 million within the next 12 months into income. The maximum length of time over which we are hedging future foreign exchange cash flow relates to our $1.8 billion U.K. pound debt maturing in 2043.

[6] Long-term debt includes foreign currency borrowings with carrying values of $2.0 billion as of September 27, 2020, which are used as hedging instruments in net investment hedge relationships.