Pensions and Other Benefit Plans - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Jan. 01, 2017	Jan. 03, 2016
Defined Benefit Plan Disclosure [Line Items]
Percentage of corridor of greater of market value of assets	10.00%
Accumulated benefit obligation unfunded plans	$ 3,800	$ 8,800
Projected benefit obligation, unfunded plans	4,600	9,900
Plan Assets	700	5,600
Fair value of company's common stock directly held in plan assets	$ 938	$ 847
Percentage of company's common stock to plan asset	3.30%	3.60%
Retirement Plans
Defined Benefit Plan Disclosure [Line Items]
Plan Assets	$ 28,404	$ 23,633	$ 22,254
Other Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
Plan Assets	281	75	$ 74
U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Contribution to pension plans	72
International Plans
Defined Benefit Plan Disclosure [Line Items]
Contribution to pension plans	592
Commingled funds | Level 2 | Other Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
Plan Assets	81	75
Short-term Investments | Level 2 | Other Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
Plan Assets	$ 200	$ 0
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