Quarterly Financial Data Asset impairment and MTM gains and losses (Details) - 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
Operating profit									$ 1,706	$ 1,387	$ 1,483
Other income (expense)									(90)	526	$ (143)
Restructuring and cost reduction charges
Operating profit	$ (84)	$ (64)	$ (5)	$ (20)	$ (39)	$ (136)	$ (98)	$ (138)	(173)	(411)
Other income (expense)	0	30	0	0	15	134	3	(4)	30	148
Gains (Losses) on mark-to-market adjustments
Operating profit	(15)	(11)	3	30	(18)	(21)	5	(47)	7	(81)
Other income (expense)	$ (397)	$ 36	$ 2	$ 9	$ 181	$ (82)	$ 1	$ 26	$ (350)	$ 126