Accumulated Other Comprehensive Income (Loss) ("AOCI") (Details) - USD ($) $ in Millions	3 Months Ended
	Apr. 02, 2021	Apr. 03, 2020
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	$ 20,841	$ 22,744
Other comprehensive (loss) income, before income taxes	(12)	(166)
Income taxes	(1)	25
Other comprehensive loss recognized during the period	(13)	(141)
Losses (gains) reclassified to earnings	(2)	(2)
Income taxes	0	0
Losses (gains) reclassified to earnings, net of income taxes	(2)	(2)
Other comprehensive loss, net of income taxes	(15)	(143)
Ending balance	20,482	22,027
Foreign currency translation
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(58)	(81)
Other comprehensive (loss) income, before income taxes	(18)	(67)
Income taxes	0	0
Other comprehensive loss recognized during the period	(18)	(67)
Losses (gains) reclassified to earnings	0	0
Income taxes	0	0
Losses (gains) reclassified to earnings, net of income taxes	0	0
Other comprehensive loss, net of income taxes	(18)	(67)
Ending balance	(76)	(148)
Net unrealized losses on hedging derivatives
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(80)	(55)
Other comprehensive (loss) income, before income taxes	6	(98)
Income taxes	(1)	25
Other comprehensive loss recognized during the period	5	(73)
Losses (gains) reclassified to earnings	(4)	3
Income taxes	1	(1)
Losses (gains) reclassified to earnings, net of income taxes	(3)	2
Other comprehensive loss, net of income taxes	2	(71)
Ending balance	(78)	(126)
Unrecognized postretirement obligations
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(701)	(372)
Other comprehensive (loss) income, before income taxes	0	(1)
Income taxes	0	0
Other comprehensive loss recognized during the period	0	(1)
Losses (gains) reclassified to earnings	2	(5)
Income taxes	(1)	1
Losses (gains) reclassified to earnings, net of income taxes	1	(4)
Other comprehensive loss, net of income taxes	1	(5)
Ending balance	(700)	(377)
Total AOCI
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(839)	(508)
Other comprehensive loss, net of income taxes	(15)	(143)
Ending balance	$ (854)	$ (651)