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Pensions, Other Post-retirement Benefits and Employee Benefit Plans (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Pension Benefits        
Net Periodic Benefit Cost [Line Items]        
Service cost $ 4 $ 5 $ 13 $ 13
Interest cost 16 17 47 51
Expected return on plan assets (15) (14) (43) (43)
Amortization of actuarial losses 9 6 20 17
Amortization of prior service credit 0 0 0 0
Net periodic benefit cost 14 14 37 38
Other Post-Retirement Benefits        
Net Periodic Benefit Cost [Line Items]        
Service cost 0 0 0 0
Interest cost 4 3 9 9
Expected return on plan assets 0 0 0 0
Amortization of actuarial losses 0 1 0 2
Amortization of prior service credit (2) (1) (3) (3)
Net periodic benefit cost $ 2 $ 3 $ 6 $ 8