Goodwill and Intangible Assets (Goodwill) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Goodwill [Line Items]
Gross Carrying Amount	$ 1,947us-gaap_GoodwillGross	$ 1,951us-gaap_GoodwillGross
Accumulated Impairment	(1,340)	(1,340)
Net Carrying Value	607us-gaap_Goodwill	611us-gaap_Goodwill
North America [Member]
Goodwill [Line Items]
Gross Carrying Amount	1,145	1,148
Accumulated Impairment	(860)	(860)
Net Carrying Value	285	288
Europe [Member]
Goodwill [Line Items]
Gross Carrying Amount	511	511
Accumulated Impairment	(330)	(330)
Net Carrying Value	181	181
South America [Member]
Goodwill [Line Items]
Gross Carrying Amount	291	292
Accumulated Impairment	(150)	(150)
Net Carrying Value	$ 141	$ 142

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266

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- Definition

Amount before accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (a,h)

-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

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- Definition

Amount of accumulated impairment loss for an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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