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Retirement Plans - Schedule Of Components Of Net Periodic Benefit Cost (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Defined Benefit Plan Disclosure [Line Items]    
Other $ 2 $ 0
Pension Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Interest cost 4 6
Expected return on plan assets (4) (6)
Actuarial (gain) loss 2 3
Net periodic benefit cost $ 4 $ 3