Amount of contributions made by the employer to defined benefit plans.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of employer's best estimate of contributions expected to be paid to the plan in the current remaining fiscal period.

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- Definition

The amount of the cost recognized during the period for defined contribution plans.

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Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan.

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Employee Benefit Plans - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
U.S. Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay			6.00%
Expensed pre-tax employer matching contributions	$ 4	$ 4	$ 11	$ 11
Canadian Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay			5.00%
Expensed pre-tax employer matching contributions	$ 3	$ 2	$ 9	8
U.S. Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Contribution to retirement plans			16	16
Anticipated contributions to the defined benefit plans in 2016			22
Canadian Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Contribution to retirement plans			20	$ 23
Anticipated contributions to the defined benefit plans in 2016			$ 26