Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Increase (Decrease) Accumulated Other Comprehensive Loss, Net of Tax
Stockholders' Equity Attributable to Parent, Beginning Balance			$ 988
Stockholders' Equity Attributable to Parent, Ending Balance	$ 1,141	$ 1,384	1,141	$ 1,384
Net Effect of Exchange Rate Fluctuations
Increase (Decrease) Accumulated Other Comprehensive Loss, Net of Tax
Stockholders' Equity Attributable to Parent, Beginning Balance	(478)	(308)	(568)	(55)
Change before reclassifications	(96)	27	(6)	(226)
Other comprehensive income (loss) attributable to the Company	(96)	27	(6)	(226)
Stockholders' Equity Attributable to Parent, Ending Balance	(574)	(281)	(574)	(281)
Change in Certain Derivative Instruments
Increase (Decrease) Accumulated Other Comprehensive Loss, Net of Tax
Stockholders' Equity Attributable to Parent, Beginning Balance	(12)	(4)	(10)	(4)
Amounts reclassified from accumulated other comprehensive income	7	(2)	5	(2)
Tax effect	1		1
Other comprehensive income (loss) attributable to the Company	8	(2)	6	(2)
Stockholders' Equity Attributable to Parent, Ending Balance	(4)	(6)	(4)	(6)
Employee Benefit Plans
Increase (Decrease) Accumulated Other Comprehensive Loss, Net of Tax
Stockholders' Equity Attributable to Parent, Beginning Balance	(1,440)	(1,357)	(1,398)	(1,394)
Amounts reclassified from accumulated other comprehensive income	15	17	(28)	38
Translation effect	10	(9)	11	6
Tax effect	1		1	1
Other comprehensive income (loss) attributable to the Company	26	8	(16)	45
Stockholders' Equity Attributable to Parent, Ending Balance	(1,414)	(1,349)	(1,414)	(1,349)
Accumulated Other Comprehensive Loss.
Increase (Decrease) Accumulated Other Comprehensive Loss, Net of Tax
Stockholders' Equity Attributable to Parent, Beginning Balance	(1,930)	(1,669)	(1,976)	(1,453)
Change before reclassifications	(96)	27	(6)	(226)
Amounts reclassified from accumulated other comprehensive income	22	15	(23)	36
Translation effect	10	(9)	11	6
Tax effect	2		2	1
Other comprehensive income (loss) attributable to the Company	(62)	33	(16)	(183)
Stockholders' Equity Attributable to Parent, Ending Balance	$ (1,992)	$ (1,636)	$ (1,992)	$ (1,636)

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Amount before tax and reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature.

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

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Amount after tax of other comprehensive income (loss) attributable to parent entity.

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Amount of tax expense (benefit) allocated to other comprehensive income (loss).

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

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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