Other Financial Data - Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	3 Months Ended						9 Months Ended
	Oct. 02, 2021	Jul. 03, 2021	Apr. 03, 2021	Sep. 26, 2020	Jun. 27, 2020	Mar. 28, 2020	Oct. 02, 2021	Sep. 26, 2020
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance at beginning of period			$ (541)				$ (541)
Other comprehensive income, net of tax	$ (28)			$ 42			30	$ 7
Balance at end of period	(248)						(248)
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance at beginning of period	(2,388)	$ (2,410)	(2,446)	(2,475)	$ (2,566)	$ (2,440)	(2,446)	(2,440)
Other comprehensive income, net of tax	(28)	22	36	42	91	(126)
Balance at end of period	(2,416)	(2,388)	(2,410)	(2,433)	(2,475)	(2,566)	(2,416)	(2,433)
Foreign Currency Translation Adjustments
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance at beginning of period	(335)		(360)	(470)		(410)	(360)	(410)
Other comprehensive income (loss) before reclassification adjustment	(47)			34			(24)	(27)
Tax benefit (expense)	3			(4)			5	(3)
Other comprehensive income, net of tax	(44)			30			(19)	(30)
Balance at end of period	(379)	(335)		(440)	(470)		(379)	(440)
Defined Benefit Plans
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance at beginning of period	(2,053)		$ (2,086)	(2,005)		$ (2,030)	(2,086)	(2,030)
Other comprehensive income, net of tax	16			12			49	37
Tax benefit	(4)			(4)			(10)	(9)
Balance at end of period	(2,037)	$ (2,053)		(1,993)	$ (2,005)		(2,037)	(1,993)
Reclassification adjustment - Actuarial net losses into Other income (Note 8)
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Reclassification adjustment before tax	22			20			65	58
Reclassification adjustment - Prior service benefits into Other income (Note 8)
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Reclassification adjustment before tax	$ (2)			$ (4)			$ (6)	$ (12)