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Pensions, Other Post-employment Benefits and Employee Benefit Plans (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Pension Benefits    
Net Periodic Benefit Cost [Line Items]    
Service cost $ 4 $ 4
Interest cost 16 17
Expected return on plan assets (14) (14)
Amortization of actuarial losses 6 5
Amortization of prior service credit 0 0
Net periodic benefit cost 12 12
Other Post-Retirement Benefits    
Net Periodic Benefit Cost [Line Items]    
Service cost 0 0
Interest cost 3 3
Expected return on plan assets 0 0
Amortization of actuarial losses 0 1
Amortization of prior service credit (1) (1)
Net periodic benefit cost $ 2 $ 3