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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 |

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