Pension Benefits (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2017	Mar. 31, 2016
Defined Benefit Plan Disclosure [Line Items]
Pension Contributions		$ 7	$ 2
General and Administrative Expense [Member] | U.S. Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost		3	4
Other pension (income) expense [Member] | U.S. Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Interest cost		10	13
Expected return on plan assets		(12)	(15)
Amortization of net loss		2	1
Amortization of prior service cost		1	1
Net periodic benefit cost		4	4
Additional loss (gain) recognized due to settlements	[1]	5	0
Pension data adjustment	[2]	$ 22	$ 0

[1] Losses are a result of settlement transactions in each of our U.S. plans which exceeded the sum of annual service and interest costs for each plan. These losses were recorded in Other pension (income) expense.

[2] Reflects a non-cash, out-of-year charge related to the adjustment of certain historical deferred vested liability balances in the Plan during the quarter ended March 31, 2017. This charge was recorded in Other pension (income) expense. See Note 5.