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Pension and Other Postretirement Benefits (Schedule of Pension Assets/(Liabilities)) (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Retirement Benefits [Abstract]
Non-current assets	$ 313	$ 14
Current liabilities	6	8
Non-current liabilities	$ 434	$ 469

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Amount of liability, recognized in statement of financial position, for defined benefit pension plan, classified as noncurrent. Excludes other postretirement benefit plan.

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Amount of asset, recognized in statement of financial position, for overfunded defined benefit pension and other postretirement plans.

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