Accumulated Other Comprehensive Income (Loss) ("AOCI") (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Oct. 02, 2020	Sep. 27, 2019	Oct. 02, 2020	Sep. 27, 2019
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	$ 22,226	$ 3,363	$ 22,744	$ 3,412
Other comprehensive loss, before income taxes			(103)	(730)
Income taxes			20	171
Other comprehensive income (loss) recognized during the period	37	(63)	(83)	(559)
Losses (gains) reclassified to earnings			(1)	18
Income taxes			2	(4)
Losses (gains) reclassified to earnings, net of income taxes	(3)	14	1	14
Other comprehensive loss	34	(49)	(82)	(545)
Ending balance	21,439	22,925	21,439	22,925
Foreign currency translation
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance			(81)	(107)
Other comprehensive loss, before income taxes			(28)	(24)
Income taxes			0	0
Other comprehensive income (loss) recognized during the period			(28)	(24)
Losses (gains) reclassified to earnings			7	0
Income taxes			0	0
Losses (gains) reclassified to earnings, net of income taxes			7	0
Other comprehensive loss			(21)	(24)
Ending balance	(102)	(131)	(102)	(131)
Net unrealized losses on hedging derivatives
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance			(55)	(19)
Other comprehensive loss, before income taxes			(75)	(75)
Income taxes			20	18
Other comprehensive income (loss) recognized during the period			(55)	(57)
Losses (gains) reclassified to earnings			8	1
Income taxes			(2)	0
Losses (gains) reclassified to earnings, net of income taxes			6	1
Other comprehensive loss			(49)	(56)
Ending balance	(104)	(75)	(104)	(75)
Unrecognized postretirement obligations
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance			(372)	(85)
Other comprehensive loss, before income taxes			0	(631)
Income taxes			0	153
Other comprehensive income (loss) recognized during the period			0	(478)
Losses (gains) reclassified to earnings			(16)	17
Income taxes			4	(4)
Losses (gains) reclassified to earnings, net of income taxes			(12)	13
Other comprehensive loss			(12)	(465)
Ending balance	(384)	(550)	(384)	(550)
Total AOCI
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(624)	(707)	(508)	(211)
Other comprehensive loss	34	(49)	(82)	(545)
Ending balance	$ (590)	$ (756)	$ (590)	$ (756)