Employee Benefits - Schedule of Other information related to Company's other post-retirement plan's (Details) - U.S. and Canadian Other Post-Retirement Benefits [Member] - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Net periodic benefit cost recognized (millions)	$ 6	$ 3	$ 4
Minimum [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Weighted-average discount rate used to determine future benefit obligations	3.99%	3.83%	4.44%
Weighted-average discount rate used to determine net periodic benefit costs	3.83%	4.44%	3.67%
Maximum [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Weighted-average discount rate used to determine future benefit obligations	4.33%	4.08%	4.95%
Weighted-average discount rate used to determine net periodic benefit costs	4.08%	4.95%	4.00%