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Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 29, 2018	Sep. 29, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 30, 2017	Sep. 30, 2017	Jul. 01, 2017	Apr. 01, 2017	Dec. 29, 2018	Dec. 30, 2017	Dec. 31, 2016
Consolidated Statements of Comprehensive Income
Net income	$ 246	$ 563	$ 224	$ 189	$ (106)	$ 159	$ 153	$ 101	$ 1,222	$ 307	$ 962
Other comprehensive income (loss), net of taxes:
Pension and postretirement benefits adjustments, net of reclassifications									(74)	109	(178)
Foreign currency translation adjustments, net of reclassifications									(43)	107	(49)
Deferred gains (losses) on hedge contracts, net of reclassifications									(13)	14	20
Other comprehensive income (loss)									(130)	230	(207)
Comprehensive income									$ 1,092	$ 537	$ 755