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v3.20.1

Pension and Retiree Medical Benefits Narrative (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 21, 2020 | Mar. 23, 2019
Domestic Plan [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Contributions by Employer, Discretionary | $ 150 | $ 150
Foreign Plan [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Contributions by Employer, Discretionary |  | $ 17

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- Definition Defined Benefit Plan, Contributions by Employer, Discretionary + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |