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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 | Dec. 31, 2016 | Dec. 26, 2015 | Dec. 27, 2014
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United States Pension Plan of US Entity, Defined Benefit |  |  |
Selected information for plans with accumulated benefit obligation in excess of plan assets (a) |  |  |
Liability for service to date | $ (12,211) | $ (6,536) |
Fair value of plan assets | 11,458 | 5,698 |
Selected information for plans with projected benefit liability in excess of plan assets |  |  |
Benefit liability | (13,192) | (13,033) |
Defined Benefit Plan, Plans with Benefit Obligations in Excess of Plan Assets, Aggregate Fair Value of Plan Assets | 11,458 | 11,397 |
Defined Benefit Plan, Fair Value of Plan Assets | 11,458 | 11,397 | $ 12,224
International |  |  |
Selected information for plans with accumulated benefit obligation in excess of plan assets (a) |  |  |
Liability for service to date | (134) | (155) |
Fair value of plan assets | 110 | 112 |
Selected information for plans with projected benefit liability in excess of plan assets |  |  |
Benefit liability | (2,773) | (511) |
Defined Benefit Plan, Plans with Benefit Obligations in Excess of Plan Assets, Aggregate Fair Value of Plan Assets | 2,492 | 406 |
Defined Benefit Plan, Fair Value of Plan Assets | 2,894 | 2,823 | 3,002
Retiree Medical Plan |  |  |
Selected information for plans with projected benefit liability in excess of plan assets |  |  |
Benefit liability | (1,208) | (1,300) |
Defined Benefit Plan, Fair Value of Plan Assets | $ 320 | $ 354 | $ 415

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