Quarterly Financial Data Asset impairment and MTM gains and losses (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 28, 2019	Sep. 28, 2019	Jun. 29, 2019	Mar. 30, 2019	Dec. 29, 2018	Sep. 29, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 28, 2019	Dec. 29, 2018	Dec. 30, 2017
Operating profit									$ 1,401	$ 1,706	$ 1,387
Other income (expense)									188	(90)	$ 526
Restructuring and cost reduction charges
Operating profit	$ (27)	$ (18)	$ (65)	$ (8)	$ (84)	$ (64)	$ (5)	$ (20)	(118)	(173)
Other income (expense)	5	0	0	0	0	30	0	0	5	30
Gains (Losses) on mark-to-market adjustments
Operating profit	0	(11)	46	(42)	(15)	(11)	3	30	(7)	7
Other income (expense)	$ (120)	$ 32	$ (11)	$ 1	$ (397)	$ 36	$ 2	$ 9	$ (98)	$ (350)