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Pensions, Other Post-retirement Benefits and Employee Benefit Plans (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Pension Benefits    
Net Periodic Benefit Cost [Line Items]    
Service cost $ 6 $ 4
Interest cost 15 16
Expected return on plan assets (15) (14)
Amortization of actuarial losses 4 6
Amortization of prior service credit 0 0
Settlement gain (8) 0
Net periodic benefit cost 18 12
Other Post-Retirement Benefits    
Net Periodic Benefit Cost [Line Items]    
Service cost 0 0
Interest cost 2 3
Expected return on plan assets 0 0
Amortization of actuarial losses 0 0
Amortization of prior service credit (1) (1)
Settlement gain 0 0
Net periodic benefit cost $ 1 $ 2