Amounts Reclassified from Accumulated Other Comprehensive Income/(Losses) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 26, 2020	Sep. 28, 2019	Sep. 26, 2020	Sep. 28, 2019
Reclassification Adjustment out of Accumulated Other Comprehensive Income/(Losses) [Line Items]
Other expense/(income)	$ (73)	$ (380)	$ (232)	$ (893)
Interest expense	314	398	1,066	1,035
Cost of products sold	4,097	4,129	12,592	12,401
Income/(loss) before income taxes	906	1,162	(256)	2,334
Provision for/(benefit from) income taxes	308	264	417	584
Net income/(loss)	598	898	(673)	1,750
Reclassification out of Accumulated Other Comprehensive Income | Net investment hedge adjustments | Foreign exchange contracts
Reclassification Adjustment out of Accumulated Other Comprehensive Income/(Losses) [Line Items]
Other expense/(income)	0	0	0	6
Interest expense	1	0	2	1
Reclassification out of Accumulated Other Comprehensive Income | Net investment hedge adjustments | Cross-currency contracts
Reclassification Adjustment out of Accumulated Other Comprehensive Income/(Losses) [Line Items]
Interest expense	(5)	(8)	(20)	(22)
Reclassification out of Accumulated Other Comprehensive Income | Net cash flow hedge adjustments | Foreign exchange contracts
Reclassification Adjustment out of Accumulated Other Comprehensive Income/(Losses) [Line Items]
Other expense/(income)	0	0	0	22
Cost of products sold	(5)	(6)	(16)	(21)
Reclassification out of Accumulated Other Comprehensive Income | Net cash flow hedge adjustments | Cross-currency contracts
Reclassification Adjustment out of Accumulated Other Comprehensive Income/(Losses) [Line Items]
Other expense/(income)	(49)	(45)	(104)	(65)
Interest expense	4	0	7	0
Reclassification out of Accumulated Other Comprehensive Income | Net cash flow hedge adjustments | Interest rate contracts
Reclassification Adjustment out of Accumulated Other Comprehensive Income/(Losses) [Line Items]
Interest expense	0	1	2	3
Reclassification out of Accumulated Other Comprehensive Income | Hedge adjustments
Reclassification Adjustment out of Accumulated Other Comprehensive Income/(Losses) [Line Items]
Income/(loss) before income taxes	54	58	129	76
Provision for/(benefit from) income taxes	22	2	25	11
Net income/(loss)	32	56	104	65
Reclassification out of Accumulated Other Comprehensive Income | Net postemployment benefit plan adjustments
Reclassification Adjustment out of Accumulated Other Comprehensive Income/(Losses) [Line Items]
Income/(loss) before income taxes	37	79	104	235
Provision for/(benefit from) income taxes	8	20	26	59
Net income/(loss)	29	59	78	176
Reclassification out of Accumulated Other Comprehensive Income | Amortization of unrecognized losses/(gains)
Reclassification Adjustment out of Accumulated Other Comprehensive Income/(Losses) [Line Items]
Other expense/(income)	(3)	(2)	(9)	(6)
Reclassification out of Accumulated Other Comprehensive Income | Amortization of prior service costs/(credits)
Reclassification Adjustment out of Accumulated Other Comprehensive Income/(Losses) [Line Items]
Other expense/(income)	(31)	(76)	(92)	(229)
Reclassification out of Accumulated Other Comprehensive Income | Settlement and curtailment losses/(gains)
Reclassification Adjustment out of Accumulated Other Comprehensive Income/(Losses) [Line Items]
Other expense/(income)	(3)	(1)	(3)	(1)
Reclassification out of Accumulated Other Comprehensive Income | Other losses/(gains) on postemployment benefits
Reclassification Adjustment out of Accumulated Other Comprehensive Income/(Losses) [Line Items]
Other expense/(income)	$ 0	$ 0	$ 0	$ 1