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Postemployment Benefits - Pension Plans - Changes in Level 3 Plan Assets (Details) - Pension Benefits - Significant Unobservable Inputs (Level 3) - USD ($)
$ in Millions
12 Months Ended
Dec. 25, 2021
Dec. 26, 2020
Total Level 3 investments    
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]    
Fair value of plan assets at beginning of year $ 83 $ 97
Additions 464 0
Net Realized Gain/(Loss) (1) (1)
Net Unrealized Gain/(Loss) (14) (3)
Net Purchases, Issuances and Settlements (37) (5)
Transfers Into/(Out of) Level 3 (1) (5)
Fair value of plan assets at end of year 494 83
Real estate    
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]    
Fair value of plan assets at beginning of year 35 45
Additions 0 0
Net Realized Gain/(Loss) (1) (1)
Net Unrealized Gain/(Loss) (1) (6)
Net Purchases, Issuances and Settlements (27) 0
Transfers Into/(Out of) Level 3 0 (3)
Fair value of plan assets at end of year 6 35
Corporate bonds and other fixed-income securities    
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]    
Fair value of plan assets at beginning of year 1 3
Additions 0 0
Net Realized Gain/(Loss) 0 0
Net Unrealized Gain/(Loss) 0 0
Net Purchases, Issuances and Settlements 0 0
Transfers Into/(Out of) Level 3 (1) (2)
Fair value of plan assets at end of year 0 1
Certain insurance contracts    
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]    
Fair value of plan assets at beginning of year 47 49
Additions 464 0
Net Realized Gain/(Loss) 0 0
Net Unrealized Gain/(Loss) (13) 3
Net Purchases, Issuances and Settlements (10) (5)
Transfers Into/(Out of) Level 3 0 0
Fair value of plan assets at end of year $ 488 $ 47