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Pension Benefits Pension Benefits Narrative (Details) - Pension
$ in Millions
1 Months Ended
Jul. 28, 2019
USD ($)
Oct. 31, 2020
USD ($)
Jun. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
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