Pensions and Other Benefit Plans - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 29, 2019	Dec. 30, 2018	Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]
Percentage of corridor of greater of market value of assets	10.00%
Accumulated benefit obligation unfunded plans	$ 4,300	$ 7,500
Projected benefit obligation, unfunded plans	5,200	8,800
Plan Assets	900	4,300
Fair value of company's common stock directly held in plan assets	$ 984	$ 876
Percentage of company's common stock to plan asset	3.10%	3.30%
Retirement Plans
Defined Benefit Plan Disclosure [Line Items]
Plan Assets	$ 32,201	$ 26,818	$ 28,404
Other Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
Plan Assets	115	180	$ 281
U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Contribution to pension plans	489
International Plans
Defined Benefit Plan Disclosure [Line Items]
Contribution to pension plans	419
Commingled funds | Level 2 | Other Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
Plan Assets	84	72
Short-term Investments | Level 2 | Other Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
Plan Assets	$ 31	$ 108
Minimum | Retirement Plans
Defined Benefit Plan Disclosure [Line Items]
Retirement plan benefits Employee compensation Period	3 years
Maximum | Retirement Plans
Defined Benefit Plan Disclosure [Line Items]
Retirement plan benefits Employee compensation Period	5 years