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Pensions and Other Benefit Plans - Narrative (Details) - USD ($) $ in Millions |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Jan. 03, 2021 | Dec. 29, 2019 | Dec. 30, 2018
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Percentage of corridor of greater of market value of assets |  |  | 10.00% |  |
Accumulated benefit obligation unfunded plans |  |  | $ 8,800 | $ 4,300 |
Projected benefit obligation, unfunded plans |  |  | 9,800 | 5,200 |
Plan Assets |  |  | 4,400 | 900 |
Fair value of company's common stock directly held in plan assets |  |  | $ 946 | $ 984 |
Percentage of company's common stock to plan asset |  |  | 2.50% | 3.10% |
Defined benefit plan, plan assets, accounting policy election, measurement date | Dec. 31, 2020 | Dec. 31, 2019 |  |  |
Retirement Plans |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Plan Assets |  |  | $ 38,195 | $ 32,201 | $ 26,818
Other Benefit Plans |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Plan Assets |  |  | 90 | 115 | $ 180
U.S. Plans |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Contribution to pension plans |  |  | 441 |  |
International Plans |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Contribution to pension plans |  |  | 429 |  |
Commingled funds | Level 2 | Other Benefit Plans |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Plan Assets |  |  | $ 90 | 84 |
Short-term Investments | Level 2 | Other Benefit Plans |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Plan Assets |  |  |  | $ 31 |
Maximum | Retirement Plans |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Retirement plan benefits Employee compensation Period |  |  | 5 years |  |

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