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Pensions, Other Post-employment Benefits and Employee Benefit Plans (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Pension Benefits        
Net Periodic Benefit Cost [Line Items]        
Service cost $ 5 $ 4 $ 9 $ 8
Interest cost 15 17 31 34
Expected return on plan assets (14) (15) (28) (29)
Amortization of actuarial losses 5 6 11 11
Amortization of prior service credit 0 0 0 0
Net periodic benefit cost 11 12 23 24
Other Post-Retirement Benefits        
Net Periodic Benefit Cost [Line Items]        
Service cost 0 0 0 0
Interest cost 2 3 5 6
Expected return on plan assets 0 0 0 0
Amortization of actuarial losses 0 0 0 1
Amortization of prior service credit 0 (1) (1) (2)
Net periodic benefit cost $ 2 $ 2 $ 4 $ 5