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Pension, Retiree Medical and Savings Plans (Level 3 Assets) (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 26, 2015 | Dec. 27, 2014 | Dec. 28, 2013
Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value | $ 874 | $ 763 | $ 675
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) | 96 | 70 |
Change in fair value of plan assets |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases, (Sales), Issuances, (Settlements) | $ 15 | $ 18 |
Large Cap Funds In United States Commingled Funds [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Representation As Percentage Of Total US Plan Assets | 18.00% | 25.00% |
Real Estate Funds [Member] | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value | $ 835 | $ 721 | 635
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) | 99 | 68 |
Change in fair value of plan assets |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases, (Sales), Issuances, (Settlements) | 15 | 18 |
Contracts With Insurance Companies | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value | 39 | 42 | $ 40
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) | (3) | 2 |
Change in fair value of plan assets |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases, (Sales), Issuances, (Settlements) | $ 0 | $ 0 |

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