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Shareholders' Equity (Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated changes in fair value of derivatives tax			$ 0	$ 0
Accumulated foreign currency translation adjustments tax			3	(1)
Accumulated pension and post-retirement benefit plans tax			204	226
Beginning balance	$ (831)	$ (876)
Other comprehensive income adjustments before reclassifications	22	(77)
Amounts reclassified from accumulated other comprehensive income	17	33
Ending balance	(792)	(920)
Accumulated foreign currency translation adjustments, net of tax of $3 and $(1)			(247)	(280)
Pension and post-retirement benefits, net of tax of $204 and $226			(542)	(638)
Fair value of derivatives, net of tax of $0 and $0			(3)	(2)
Total accumulated other comprehensive loss	(831)	(876)	(792)	(920)
Accumulated foreign currency translation adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(269)	(203)
Other comprehensive income adjustments before reclassifications	22	(77)
Amounts reclassified from accumulated other comprehensive income	0	0
Ending balance	(247)	(280)
Total accumulated other comprehensive loss	(269)	(203)	(247)	(280)
Accumulated pension liability adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(560)	(670)
Other comprehensive income adjustments before reclassifications	0	0
Amounts reclassified from accumulated other comprehensive income	18	32
Ending balance	(542)	(638)
Total accumulated other comprehensive loss	(560)	(670)	(542)	(638)
Changes in fair value of derivatives
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(2)	(3)
Other comprehensive income adjustments before reclassifications	0	0
Amounts reclassified from accumulated other comprehensive income	(1)	1
Ending balance	(3)	(2)
Total accumulated other comprehensive loss	$ (2)	$ (3)	$ (3)	$ (2)

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Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Tax

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Accumulated change, net of tax, in accumulated gains and losses from derivative instruments designated and qualifying as the effective portion of cash flow hedges. Includes an entity's share of an equity investee's Increase or Decrease in deferred hedging gains or losses.

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The total of net gain (loss), prior service cost (credit), and transition assets (obligations), as well as minimum pension liability if still remaining, included in accumulated other comprehensive income associated with a defined benefit pension or other postretirement plan(s) because they have yet to be recognized as components of net periodic benefit cost.

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Accumulated adjustment, net of tax, that results from the process of translating subsidiary financial statements and foreign equity investments into the reporting currency from the functional currency of the reporting entity, net of reclassification of realized foreign currency translation gains or losses.

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Amount after tax, before reclassification adjustments of other comprehensive income (loss).

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