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Employee Benefit Plans - Benefit Expenses (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
U.S. Plans        
Pension service cost:        
Service cost     $ 0 $ 0
Pension financing benefits (cost):        
Interest cost $ (5) $ (6) (13) (18)
Expected return on plan assets 9 10 28 29
Amortization of losses and other     (2) 0
Total pension financing benefits: 4 4 13 11
Restructuring related pension cost:        
Special termination benefits   (1) 0 (3)
Net pension benefit (cost) 4 3 13 8
Foreign Plan        
Pension service cost:        
Service cost (1)   (1) (1)
Pension financing benefits (cost):        
Interest cost (1) (2) (4) (5)
Expected return on plan assets 2 2 6 6
Amortization of losses and other (1) (1) (2) (2)
Total pension financing benefits:   (1) 0 (1)
Restructuring related pension cost:        
Special termination benefits     0 (1)
Net pension benefit (cost) $ (1) $ (1) $ (1) $ (3)