Quarterly Financial Data Asset impairment and MTM gains and losses (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 30, 2017	Sep. 30, 2017	Jul. 01, 2017	Apr. 01, 2017	Dec. 31, 2016	Oct. 01, 2016	Jul. 02, 2016	Apr. 02, 2016	Dec. 30, 2017	Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract]
Restructuring, Settlement and Impairment Provisions	$ 24	$ 1	$ 96	$ 142	$ 161	$ 40	$ 72	$ 52	$ 263	$ 325
Gain Loss On Mark To Market Adjustments	(163)	104	(7)	21	226	31	(20)	24	(45)	261
Pre Tax Charges Gains In Operating Profit	$ (139)	$ 105	$ 89	$ 163	$ 387	$ 71	$ 52	$ 76	$ 218	$ 586