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Pension Benefits Pension Benefits Narrative (Details) - Pension
$ in Millions
1 Months Ended 3 Months Ended 12 Months Ended
Jul. 28, 2019
USD ($)
Oct. 31, 2020
USD ($)
Jun. 27, 2020
USD ($)
Jan. 02, 2021
USD ($)
United States        
Defined Benefit Plan Disclosure [Line Items]        
Defined Benefit Plan, Plan Assets, Payment for Settlement       $ 174
Curtailment gain $ 11   $ 7  
Number of retired participants accepting settlement of defined benefit pension plan obligations   8,000    
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Settlement   $ 453    
UNITED KINGDOM        
Defined Benefit Plan Disclosure [Line Items]        
Buy-in annuity contract       $ 268