Shareholders' Equity - Changes in AOCI (Details) - USD ($) $ in Millions	6 Months Ended
	Jul. 04, 2021	Jun. 28, 2020
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance	$ (3,550)
Other comprehensive income, pretax	116	$ 163
Provision for income tax, net	(13)	(56)
Other comprehensive income, net of tax	103	107
Ending Balance	(3,447)
Gains on Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance	272	2
Other comprehensive income, pretax	(86)	71
Provision for income tax, net	23	(20)
Other comprehensive income, net of tax	(63)	51
Ending Balance	209	53
Foreign Currency Translation Adjustments
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance	641	288
Other comprehensive income, pretax	30	(79)
Provision for income tax, net	0	0
Other comprehensive income, net of tax	30	(79)
Ending Balance	671	209
Changes in Retirement Plans’ Funded Status
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance	(4,463)	(4,108)
Other comprehensive income, pretax	172	171
Provision for income tax, net	(36)	(36)
Other comprehensive income, net of tax	136	135
Ending Balance	(4,327)	(3,973)
AOCL
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance	(3,550)	(3,818)
Ending Balance	$ (3,447)	$ (3,711)