v3.25.4
Pension, Retiree Medical and Savings Plans (Categorized Plan Assets Measured at Fair Value) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 27, 2025
Dec. 28, 2024
Dec. 30, 2023
Defined Benefit Plan Disclosure [Line Items]      
Maximum Real estate notice period 90 days    
Minimum Real estate notice period 30 days    
Cash Collateral for Borrowed Securities $ 430 $ 447  
US Plan Assets [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 11,104 10,772  
Foreign Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 3,652 3,397 $ 3,528
Domestic Plan      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 10,949 10,609 11,541
Securities Loaned 649 630  
Postretirement Health Coverage [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount $ 155 $ 163 $ 183
Defined Benefit Plan, Equity Securities, Large Cap [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Representation of one fund in total U.S. plan assets 12.00% 12.00%  
Fixed Income Commingled funds [Member] | Level 1 | Foreign Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount $ 616 $ 557  
Mortgage-backed Securities, Issued by Private Enterprises [Member] | Level 2 | Domestic Plan      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 134 125  
US Government Agencies Debt Securities [Member] | Level 2 | Domestic Plan      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 1,573 1,538  
Corporate Bonds [Member] | Level 2 | Foreign Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 610 469  
Corporate Bonds [Member] | Level 2 | Domestic Plan      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 3,963 3,903  
Government Securities | Level 2 | Foreign Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount $ 987 $ 932  
Corporate Bonds      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Investment within Plan Asset Category, Percentage 31.00% 31.00%  
Contracts With Insurance Companies | Level 3 | Foreign Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount $ 0 $ 29  
Contracts With Insurance Companies | Level 3 | Domestic Plan      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 1 1  
Cash And Cash Equivalents | Level 1 | Foreign Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 85 128  
Cash And Cash Equivalents | Level 1 | Domestic Plan      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 446 456  
Cash And Cash Equivalents | Level 2 | Domestic Plan      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 254 276  
Cash And Cash Equivalents | Fair Value, Inputs, Level 1, 2 and 3 | Domestic Plan      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 700 732  
Real Estate Funds [Member] | Fair Value Measured at Net Asset Value Per Share | Foreign Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 122 79  
Real Estate Funds [Member] | Fair Value Measured at Net Asset Value Per Share | Domestic Plan      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 817 561  
Dividends And Interest Receivable | Fair Value Measured at Net Asset Value Per Share | Foreign Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 17 31  
Dividends And Interest Receivable | Fair Value Measured at Net Asset Value Per Share | Domestic Plan      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount (332) (358)  
Equity Securities [Member] | Level 1 | Domestic Plan      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 4,248 4,270  
Equity Securities [Member] | Fair Value, Inputs, Level 1, 2 and 3 | Foreign Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 1,215 1,172  
Sub-Total U.S. Plan Assets | Fair Value, Inputs, Level 1, 2 and 3 | Domestic Plan      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 10,619 10,569  
Sub-Total International Plan Assets | Fair Value, Inputs, Level 1, 2 and 3 | Foreign Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount $ 3,513 $ 3,287