Pension Benefits Change in Projected Benefit Obligations, Plan Assets, and Funding Status (Details) - USD ($) $ in Millions	1 Months Ended		3 Months Ended	12 Months Ended
	Jan. 31, 2019	Sep. 30, 2017	Sep. 29, 2018	Dec. 29, 2018	Dec. 30, 2017
Amounts Recognized in Balance Sheet
Other Assets				$ 228	$ 252
Other liabilities				(651)	(839)
Europe | Europe | Project K | Pension
Defined Benefit Plan Disclosure [Line Items]
Curtailment gain			$ 30
U.S. and Canada | Project K
Defined Benefit Plan Disclosure [Line Items]
Curtailment gain		$ 136
U.S. and Canada defined contribution plans | Minimum
Amounts Recognized in Balance Sheet
Defined Contribution Plan, Employer Matching Contribution, Percent of Match	3.00%
U.S. and Canada defined contribution plans | Maximum
Amounts Recognized in Balance Sheet
Defined Contribution Plan, Employer Matching Contribution, Percent of Match	7.00%
Global | Pension
Change in Benefit Obligation [Roll Forward]
Beginning of Year				5,648	5,510
Service Cost				87	96
Interest Cost				165	164
Plan participants' contributions				1	1
Plan Amendments				6	6
Actuarial (gain) loss				(384)	264
Benefits paid				(280)	(395)
Curtailments and special termination benefits				(36)	(156)
Other				1	1
Foreign Currency Adjustments				(91)	157
End of Year				5,117	5,648
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value, Beginning of Year				5,043	4,544
Actual Return on Plan Assets				(299)	666
Employer Contributions				270	31
Plan participants' contributions				1	1
Benefits Paid, Plan Assets				(236)	(364)
Other				(1)	1
Foreign Currency Adjustments				(101)	164
Fair Value, End of Year				4,677	5,043
Funded Status				(440)	(605)
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss)
Prior Service Cost				41	48
Net Amount Recognized				41	48
Amounts Recognized in Balance Sheet
Other Assets				228	252
Other Current Liabilities				(17)	(19)
Other liabilities				(651)	(838)
Net Amount Recognized				(440)	(605)
Defined Benefit Plan, Accumulated Benefit Obligation				$ 5,000	$ 5,400