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Retirement and Benefit Plans - Defined Benefit Retirement Plans with Overfunded and Underfunded Status (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Defined Benefit Plan Change In Fair Value Roll Forward      
Fair value of plan assets at January 1 $ 175    
Fair value of plan assets at December 31 173 $ 175  
Defined Benefit Plan, Change in Benefit Obligation      
Interest cost 6 7 $ 7
Underfunded defined benefit pension plans      
Defined Benefit Plan Change In Fair Value Roll Forward      
Fair value of plan assets at January 1 175 164  
Actual return on assets 13 26  
Contributions 2 2  
Settlement (9) (9)  
Benefits paid (8) (8)  
Fair value of plan assets at December 31 173 175 164
Defined Benefit Plan, Change in Benefit Obligation      
Projected benefit obligation at January 1 194 181  
Interest cost 6 7  
Settlement (9) (9)  
Actuarial loss 20 23  
Benefits paid (8) (8)  
Projected benefit obligation at December 31 203 194 $ 181
Underfunded projected benefit obligation at December 31 (30) (19)  
Accumulated benefit obligation at December 31 $ 203 $ 194