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Employee Benefit Plans - Benefit Expenses (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
U.S. Plans        
Pension service cost:        
Service cost     $ 0 $ 0
Pension financing benefits (cost):        
Interest cost $ (4) $ (6) (8) (12)
Expected return on plan assets 10 9 19 19
Amortization of losses and other (1)   (2) 0
Total pension financing benefits: 5 3 9 7
Special termination benefits   (1) 0 (2)
Net pension benefit (cost) 5 2 9 5
Foreign Plan        
Pension service cost:        
Service cost   (1) 0 (1)
Pension financing benefits (cost):        
Interest cost (1) (1) (3) (3)
Expected return on plan assets 2 2 4 4
Amortization of losses and other $ (1) (1) (1) (1)
Total pension financing benefits:     0 0
Special termination benefits   (1) 0 (1)
Net pension benefit (cost)   $ (2) $ 0 $ (2)