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Pensions, Other Post-retirement Benefits and Employee Benefit Plans Net Periodic Benefit Cost (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Pension Benefits      
Net Periodic Benefit Cost [Line Items]      
Service cost $ 18 $ 18 $ 19
Interest cost 63 70 66
Expected return on plan assets (58) (59) (71)
Amortization of actuarial losses 26 22 26
Amortization of prior service credit 0 0 0
Curtailment gain 0 0 (2)
Net periodic benefit cost 49 51 38
Other Post-Retirement Benefits      
Net Periodic Benefit Cost [Line Items]      
Service cost 0 0 0
Interest cost 12 14 13
Expected return on plan assets 0 0 0
Amortization of actuarial losses 0 2 5
Amortization of prior service credit (4) (4) (4)
Curtailment gain 0 0 0
Net periodic benefit cost $ 8 $ 12 $ 14