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Employee Benefit Plans - Components of Net Periodic Benefit Expense (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2019
Retirement Benefits [Abstract]    
Service costs $ 1 $ 1
Interest costs 3 3
Expected return on plan assets (5) (5)
Net periodic benefit expense $ (1) $ (1)