Shareholders' Equity - Accumulated Other Comprehensive Loss and Other Comprehensive Income (Details) - USD ($) $ in Millions	9 Months Ended
	Oct. 02, 2021	Oct. 03, 2020
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning of period	$ (1,739)
Other comprehensive income (loss) before reclassifications	(34)	$ 23
Reclassified from Accumulated other comprehensive loss	103	107
End of period	(1,670)
Accumulated Other Comprehensive Loss
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning of period	(1,739)	(1,847)
End of period	(1,670)	(1,717)
Pension and Postretirement Benefits Adjustments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning of period	(1,780)	(1,811)
Other comprehensive income (loss) before reclassifications	0	0
Reclassified from Accumulated other comprehensive loss	90	110
End of period	(1,690)	(1,701)
Foreign Currency Translation Adjustments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning of period	42	(36)
Other comprehensive income (loss) before reclassifications	(36)	25
Reclassified from Accumulated other comprehensive loss	14	0
End of period	20	(11)
Deferred Gains (Losses) on Hedge Contracts
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning of period	(1)	0
Other comprehensive income (loss) before reclassifications	2	(2)
Reclassified from Accumulated other comprehensive loss	(1)	(3)
End of period	$ 0	$ (5)