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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 [Member] - USD ($)
$ in Millions
Dec. 31, 2015
Dec. 31, 2014
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Accumulated projected benefit obligation $ 105 $ 116
Fair value of plan assets 18 19
Funded status (87) (97)
Unrecognized prior-service credit (3) (4)
Unrecognized loss 7 15
Net amount recognized $ (83) $ (86)