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Employee Benefit Plans - Net period cost (Details) - Pension Benefits - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Components of net periodic benefit cost [Abstract]        
Service cost $ 5 $ 5 $ 10 $ 8
Interest cost 18 7 36 14
Expected return on plan assets (30) (10) (60) (20)
Amortization of net actuarial loss 2 2 4 5
Net periodic cost (benefit) $ (5) $ 4 $ (10) $ 7