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Pension, Retiree Medical and Savings Plans (Selected Information About Plans with Liability for Service to Date and Total Benefit Liability in Excess of Plan Assets) (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 29, 2018 | Dec. 30, 2017
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Unfunded Plan | 830 |
Domestic Plan [Member] |  |
Selected information for plans with accumulated benefit obligation in excess of plan assets |  |
Liability for service to date | $ (8,040) | $ (8,355)
Fair value of plan assets | 7,223 | 6,919
Selected information for plans with projected benefit liability in excess of plan assets |  |
Defined Benefit Plan, Pension Plan with Projected Benefit Obligation in Excess of Plan Assets, Projected Benefit Obligation | (8,957) | (9,400)
Defined Benefit Plan, Pension Plan with Projected Benefit Obligation in Excess of Plan Assets, Plan Assets | 7,223 | 6,919
Foreign Plan [Member] |  |
Selected information for plans with accumulated benefit obligation in excess of plan assets |  |
Liability for service to date | (155) | (161)
Fair value of plan assets | 121 | 119
Selected information for plans with projected benefit liability in excess of plan assets |  |
Defined Benefit Plan, Pension Plan with Projected Benefit Obligation in Excess of Plan Assets, Projected Benefit Obligation | (514) | (1,273)
Defined Benefit Plan, Pension Plan with Projected Benefit Obligation in Excess of Plan Assets, Plan Assets | 426 | 1,158
Retiree Medical Plan |  |
Selected information for plans with projected benefit liability in excess of plan assets |  |
Defined Benefit Plan, Pension Plan with Projected Benefit Obligation in Excess of Plan Assets, Projected Benefit Obligation | (996) | (1,187)
Defined Benefit Plan, Pension Plan with Projected Benefit Obligation in Excess of Plan Assets, Plan Assets | $ 285 | $ 321

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