Financial Instruments - Derivative Financial Instruments and Hedging Activities (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2019	Jul. 01, 2018	Jun. 30, 2019	Jul. 01, 2018
OID [Member]
Derivative [Line Items]
Amount of Gains/(Losses) Recognized in OID	[1]	$ (4)	$ 62	$ (124)	$ 6
Not Designated as Hedging Instrument [Member] | OID [Member] | Foreign exchange contracts [Member]
Derivative [Line Items]
Amount of Gains/(Losses) Recognized in OID	[1]	(4)	61	(124)	6
Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member] | OID [Member] | Foreign exchange contracts [Member]
Derivative [Line Items]
Amount of Gains/(Losses) Recognized in OID	[1],[2]	0	0	0	0
Amount excluded from effectiveness testing recognized in earnings based on an amortization approach	[1]	0	0	0	0
Fair Value Hedging [Member] | Designated as Hedging Instrument [Member] | OID [Member] | Foreign exchange contracts [Member]
Derivative [Line Items]
Amount of Gains/(Losses) Recognized in OID	[1]	0	12	0	4
Fair Value Hedging [Member] | Designated as Hedging Instrument [Member] | OID [Member] | Interest rate contracts [Member]
Derivative [Line Items]
Amount of Gains/(Losses) Recognized in OID	[1]	483	(121)	813	(520)
Fair Value Hedging [Member] | Designated as Hedging Instrument [Member] | OID [Member] | Interest rate contracts, hedged item gain/(loss) [Member]
Derivative [Line Items]
Amount of Gains/(Losses) Recognized in OID	[1]	(483)	121	(813)	520
Fair Value Hedging [Member] | Designated as Hedging Instrument [Member] | OID [Member] | Foreign exchange contracts, hedged item gain (loss) [Member]
Derivative [Line Items]
Amount of Gains/(Losses) Recognized in OID	[1]	0	(12)	0	(4)
Net Investment Hedging [Member] | Designated as Hedging Instrument [Member] | OID [Member] | Foreign exchange contracts [Member]
Derivative [Line Items]
Amount of Gains/(Losses) Recognized in OID	[1]	0	0	0	0
The portion on foreign exchange contracts excluded from the assessment of hedge effectiveness	[1]	0	0	0	0
Net Investment Hedging, Nonderivative Instruments [Member] | OID [Member] | Foreign currency short-term borrowings [Member]
Derivative [Line Items]
Amount of Gains/(Losses) Recognized in OID	[1],[3]	0	0	0	0
Net Investment Hedging, Nonderivative Instruments [Member] | OID [Member] | Foreign currency long-term debt [Member]
Derivative [Line Items]
Amount of Gains/(Losses) Recognized in OID	[1],[3]	0	0	0	0
Other Derivative Instruments [Member] | OID [Member]
Derivative [Line Items]
Amount of Gains/(Losses) Recognized in OID	[1]	0	0	0	0
Amount of Gains/(Losses) Recognized in OCI [Member]
Derivative [Line Items]
Amount of Gains/(Losses) Recognized in OCI	[1],[4]	(216)	577	188	325
Amount of Gains/(Losses) Recognized in OCI [Member] | Not Designated as Hedging Instrument [Member] | Foreign exchange contracts [Member]
Derivative [Line Items]
Amount of Gains/(Losses) Recognized in OCI	[1],[4]	0	0	0	0
Amount of Gains/(Losses) Recognized in OCI [Member] | Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member] | Foreign exchange contracts [Member]
Derivative [Line Items]
Amount excluded from effectiveness testing recognized in earnings based on an amortization approach	[1],[4]	28	20	84	48
Amount of Gains/(Losses) Recognized in OCI	[1],[2],[4]	(204)	107	6	(36)
Amount of Gains/(Losses) Recognized in OCI [Member] | Fair Value Hedging [Member] | Designated as Hedging Instrument [Member] | Foreign exchange contracts [Member]
Derivative [Line Items]
Amount of Gains/(Losses) Recognized in OCI	[1],[4]	0	0	0	0
Amount of Gains/(Losses) Recognized in OCI [Member] | Fair Value Hedging [Member] | Designated as Hedging Instrument [Member] | Interest rate contracts [Member]
Derivative [Line Items]
Amount of Gains/(Losses) Recognized in OCI	[1],[4]	0	0	0	0
Amount of Gains/(Losses) Recognized in OCI [Member] | Fair Value Hedging [Member] | Designated as Hedging Instrument [Member] | Interest rate contracts, hedged item gain/(loss) [Member]
Derivative [Line Items]
Amount of Gains/(Losses) Recognized in OCI	[1],[4]	0	0	0	0
Amount of Gains/(Losses) Recognized in OCI [Member] | Fair Value Hedging [Member] | Designated as Hedging Instrument [Member] | Foreign exchange contracts, hedged item gain (loss) [Member]
Derivative [Line Items]
Amount of Gains/(Losses) Recognized in OCI	[1],[4]	0	0	0	0
Amount of Gains/(Losses) Recognized in OCI [Member] | Net Investment Hedging [Member] | Designated as Hedging Instrument [Member] | Foreign exchange contracts [Member]
Derivative [Line Items]
The portion on foreign exchange contracts excluded from the assessment of hedge effectiveness	[1],[4]	52	25	93	27
Amount of Gains/(Losses) Recognized in OCI	[1],[4]	(48)	153	(25)	148
Amount of Gains/(Losses) Recognized in OCI [Member] | Net Investment Hedging, Nonderivative Instruments [Member] | Foreign currency short-term borrowings [Member]
Derivative [Line Items]
Amount of Gains/(Losses) Recognized in OCI	[1],[3],[4]	(16)	85	19	43
Amount of Gains/(Losses) Recognized in OCI [Member] | Net Investment Hedging, Nonderivative Instruments [Member] | Foreign currency long-term debt [Member]
Derivative [Line Items]
Amount of Gains/(Losses) Recognized in OCI	[1],[3],[4]	(27)	186	11	94
Amount of Gains/(Losses) Recognized in OCI [Member] | Other Derivative Instruments [Member]
Derivative [Line Items]
Amount of Gains/(Losses) Recognized in OCI	[1],[4]	0	1	1	1
Amount of Gains/(Losses) Reclassified from OCI into OID and COS [Member] | OID [Member]
Derivative [Line Items]
Amount of Gains/(Losses) Reclassified from OCI into OID and COS	[1],[4]	111	(289)	398	(328)
Amount of Gains/(Losses) Reclassified from OCI into OID and COS [Member] | Not Designated as Hedging Instrument [Member] | OID [Member] | Foreign exchange contracts [Member]
Derivative [Line Items]
Amount of Gains/(Losses) Reclassified from OCI into OID and COS	[1],[4]	0	0	0	0
Amount of Gains/(Losses) Reclassified from OCI into OID and COS [Member] | Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member] | OID [Member] | Foreign exchange contracts [Member]
Derivative [Line Items]
Amount excluded from effectiveness testing recognized in earnings based on an amortization approach	[1],[4]	32	20	86	48
Amount of Gains/(Losses) Reclassified from OCI into OID and COS	[1],[2],[4]	48	(330)	257	(402)
Amount of Gains/(Losses) Reclassified from OCI into OID and COS [Member] | Fair Value Hedging [Member] | Designated as Hedging Instrument [Member] | OID [Member] | Foreign exchange contracts [Member]
Derivative [Line Items]
Amount of Gains/(Losses) Reclassified from OCI into OID and COS	[1],[4]	0	0	0	0
Amount of Gains/(Losses) Reclassified from OCI into OID and COS [Member] | Fair Value Hedging [Member] | Designated as Hedging Instrument [Member] | OID [Member] | Interest rate contracts [Member]
Derivative [Line Items]
Amount of Gains/(Losses) Reclassified from OCI into OID and COS	[1],[4]	0	0	0	0
Amount of Gains/(Losses) Reclassified from OCI into OID and COS [Member] | Fair Value Hedging [Member] | Designated as Hedging Instrument [Member] | OID [Member] | Interest rate contracts, hedged item gain/(loss) [Member]
Derivative [Line Items]
Amount of Gains/(Losses) Reclassified from OCI into OID and COS	[1],[4]	0	0	0	0
Amount of Gains/(Losses) Reclassified from OCI into OID and COS [Member] | Fair Value Hedging [Member] | Designated as Hedging Instrument [Member] | OID [Member] | Foreign exchange contracts, hedged item gain (loss) [Member]
Derivative [Line Items]
Amount of Gains/(Losses) Reclassified from OCI into OID and COS	[1],[4]	0	0	0	0
Amount of Gains/(Losses) Reclassified from OCI into OID and COS [Member] | Net Investment Hedging [Member] | Designated as Hedging Instrument [Member] | OID [Member] | Foreign exchange contracts [Member]
Derivative [Line Items]
The portion on foreign exchange contracts excluded from the assessment of hedge effectiveness	[1],[4]	31	21	55	26
Amount of Gains/(Losses) Reclassified from OCI into OID and COS	[1],[4]	0	0	0	0
Amount of Gains/(Losses) Reclassified from OCI into OID and COS [Member] | Net Investment Hedging, Nonderivative Instruments [Member] | OID [Member] | Foreign currency short-term borrowings [Member]
Derivative [Line Items]
Amount of Gains/(Losses) Reclassified from OCI into OID and COS	[1],[3],[4]	0	0	0	0
Amount of Gains/(Losses) Reclassified from OCI into OID and COS [Member] | Net Investment Hedging, Nonderivative Instruments [Member] | OID [Member] | Foreign currency long-term debt [Member]
Derivative [Line Items]
Amount of Gains/(Losses) Reclassified from OCI into OID and COS	[1],[3],[4]	0	0	0	0
Amount of Gains/(Losses) Reclassified from OCI into OID and COS [Member] | Other Derivative Instruments [Member] | OID [Member]
Derivative [Line Items]
Amount of Gains/(Losses) Reclassified from OCI into OID and COS	[1],[4]	$ 0	$ 1	$ 0	$ 1

[1] 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.

[2] Based on quarter-end foreign exchange rates that are subject to change, we expect to reclassify a pre-tax gain of $155 million within the next 12 months into Cost of sales. 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.

[3] Short-term borrowings include foreign currency short-term borrowings with carrying values of $1.1 billion as of June 30, 2019, which are used as hedging instruments in net investment hedges. Long-term debt includes foreign currency long-term borrowings with carrying values of $2.0 billion as of June 30, 2019, which are used as hedging instruments in net investment hedges. The following table provides the total amount of each income and expense line in which the results of fair value or cash flow hedges are recorded:     Three Months Ended   Six Months Ended (MILLIONS OF DOLLARS)
June 30,
2019
  July 1,
2018
  June 30
2019
  July 1,
2018
Cost of sales
$ 2,576
  $ 2,916
  $ 5,009
  $ 5,479
Other (income)/deductions—net
126
  (551 )   218
  (728 )

[4] For derivative financial instruments in cash flow hedge relationships, the gains and losses are included in Other comprehensive income––Unrealized holding gains/(losses) on derivative financial instruments, net. For derivative financial instruments in net investment hedge relationships and for foreign currency debt designated as hedging instruments, the effective portion is included in Other comprehensive income––Foreign currency translation adjustments, net.