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Pensions, Other Post-employment Benefits and Employee Benefit Plans Net Periodic Benefit Cost (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Pension Benefits      
Net Periodic Benefit Cost [Line Items]      
Service cost $ 18 $ 19 $ 16
Interest cost 70 66 76
Expected return on plan assets (59) (71) (74)
Amortization of actuarial losses 22 26 10
Amortization of prior service credit 0 0 0
Settlement (gain) loss 0 0 (2)
Curtailment gain 0 (2) 0
Net periodic benefit cost 51 38 26
Other Post-Employment Benefits      
Net Periodic Benefit Cost [Line Items]      
Service cost 0 0 0
Interest cost 14 13 15
Expected return on plan assets 0 0 0
Amortization of actuarial losses 2 5 3
Amortization of prior service credit (4) (4) (5)
Settlement (gain) loss 0 0 0
Curtailment gain 0 0 0
Net periodic benefit cost $ 12 $ 14 $ 13