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Retirement Benefits - Subsequent Event (Details)
$ in Millions
9 Months Ended
Sep. 24, 2021
USD ($)
numberOfParticipants
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract]  
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Settlement $ 63
Defined Benefit Plan, Benefit Obligation $ 414
Participants transferred | numberOfParticipants 421
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement $ (12)