Pensions and Other Benefit Plans - Schedule of Defined Benefit Plans Disclosures (Details) - Retirement plans - USD ($) $ in Millions	Jan. 03, 2021	Dec. 29, 2019	Dec. 30, 2018
Defined Benefit Plan Disclosure [Line Items]
Plan Assets	$ 38,195	$ 32,201	$ 26,818
Fair Value, Measurements, Recurring
Defined Benefit Plan Disclosure [Line Items]
Plan Assets	38,195	32,201
Investments Measured at Net Asset Value	9,092	8,053
Fair Value, Measurements, Recurring | Level 1
Defined Benefit Plan Disclosure [Line Items]
Plan Assets	14,502	12,602
Fair Value, Measurements, Recurring | Level 2
Defined Benefit Plan Disclosure [Line Items]
Plan Assets	14,420	11,346
Fair Value, Measurements, Recurring | Level 3
Defined Benefit Plan Disclosure [Line Items]
Plan Assets	181	200
Fair Value, Measurements, Recurring | Short-term investment funds
Defined Benefit Plan Disclosure [Line Items]
Plan Assets	890	524
Fair Value, Measurements, Recurring | Short-term investment funds | Level 1
Defined Benefit Plan Disclosure [Line Items]
Plan Assets	127	119
Fair Value, Measurements, Recurring | Short-term investment funds | Level 2
Defined Benefit Plan Disclosure [Line Items]
Plan Assets	763	405
Fair Value, Measurements, Recurring | Short-term investment funds | Level 3
Defined Benefit Plan Disclosure [Line Items]
Plan Assets	0	0
Fair Value, Measurements, Recurring | Government and agency securities
Defined Benefit Plan Disclosure [Line Items]
Plan Assets	5,023	4,140
Fair Value, Measurements, Recurring | Government and agency securities | Level 1
Defined Benefit Plan Disclosure [Line Items]
Plan Assets	0	0
Fair Value, Measurements, Recurring | Government and agency securities | Level 2
Defined Benefit Plan Disclosure [Line Items]
Plan Assets	5,023	4,140
Fair Value, Measurements, Recurring | Government and agency securities | Level 3
Defined Benefit Plan Disclosure [Line Items]
Plan Assets	0	0
Fair Value, Measurements, Recurring | Debt instruments
Defined Benefit Plan Disclosure [Line Items]
Plan Assets	3,931	3,452
Fair Value, Measurements, Recurring | Debt instruments | Level 1
Defined Benefit Plan Disclosure [Line Items]
Plan Assets	0	0
Fair Value, Measurements, Recurring | Debt instruments | Level 2
Defined Benefit Plan Disclosure [Line Items]
Plan Assets	3,931	3,452
Fair Value, Measurements, Recurring | Debt instruments | Level 3
Defined Benefit Plan Disclosure [Line Items]
Plan Assets	0	0
Fair Value, Measurements, Recurring | Equity securities
Defined Benefit Plan Disclosure [Line Items]
Plan Assets	14,377	12,485
Fair Value, Measurements, Recurring | Equity securities | Level 1
Defined Benefit Plan Disclosure [Line Items]
Plan Assets	14,375	12,483
Fair Value, Measurements, Recurring | Equity securities | Level 2
Defined Benefit Plan Disclosure [Line Items]
Plan Assets	2	2
Fair Value, Measurements, Recurring | Equity securities | Level 3
Defined Benefit Plan Disclosure [Line Items]
Plan Assets	0	0
Fair Value, Measurements, Recurring | Commingled funds
Defined Benefit Plan Disclosure [Line Items]
Plan Assets	13,086	11,099
Investments Measured at Net Asset Value	8,236	7,580
Fair Value, Measurements, Recurring | Commingled funds | Level 1
Defined Benefit Plan Disclosure [Line Items]
Plan Assets	0	0
Fair Value, Measurements, Recurring | Commingled funds | Level 2
Defined Benefit Plan Disclosure [Line Items]
Plan Assets	4,690	3,338
Fair Value, Measurements, Recurring | Commingled funds | Level 3
Defined Benefit Plan Disclosure [Line Items]
Plan Assets	160	181
Fair Value, Measurements, Recurring | Other assets
Defined Benefit Plan Disclosure [Line Items]
Plan Assets	888	501
Investments Measured at Net Asset Value	856	473
Fair Value, Measurements, Recurring | Other assets | Level 1
Defined Benefit Plan Disclosure [Line Items]
Plan Assets	0	0
Fair Value, Measurements, Recurring | Other assets | Level 2
Defined Benefit Plan Disclosure [Line Items]
Plan Assets	11	9
Fair Value, Measurements, Recurring | Other assets | Level 3
Defined Benefit Plan Disclosure [Line Items]
Plan Assets	$ 21	$ 19