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Pension and Retiree Medical Benefits Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 20, 2021 | Mar. 21, 2020 | Dec. 31, 2021 | Aug. 31, 2021
Domestic Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Contributions by Employer, Discretionary | $ 300 | $ 150 |  |
Domestic Plan [Member] | Forecast |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Expected Future Employer Contributions, Remainder of Fiscal Year |  |  |  | $ 200
Pension Cost (Reversal of Cost) |  |  | $ 70 |
Foreign Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Contributions by Employer, Discretionary | $ 25 |  |  |
Defined Benefit Plan, Funded Plan | Forecast |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Pension Cost (Reversal of Cost) |  |  | $ 45 |

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