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Employee Benefits - Overview of the accumulated benefit obligation, fair value of plan assets, funded status and net amount recognized for U.S. and Canadian Other Post-Retirement Benefits (Details) - U.S. and Canadian Other Post-Retirement Benefits - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Accumulated projected benefit obligation $ 91 $ 99
Fair value of plan assets 14 17
Funded status (77) (82)
Unrecognized prior-service credit (1) (1)
Unrecognized loss (6) (3)
Net amount recognized $ (84) $ (86)