v2.3.0.11

Goodwill And Acquired Intangible Assets (Schedule of Gross Carrying Amount and Accumulated Amortization for Teradata's Identifiable Intangible Assets) (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2011	Dec. 31, 2010
Maximum [Member] | Intellectual Property/Developed Technology [Member]
Weighted Average Useful Life, Years	7
Maximum [Member] | Customer Relationships [Member]
Weighted Average Useful Life, Years	10
Maximum [Member] | Trademarks/Trade Names [Member]
Weighted Average Useful Life, Years	10
Maximum [Member] | Total [Member]
Weighted Average Useful Life, Years	10
Minimum [Member] | Intellectual Property/Developed Technology [Member]
Weighted Average Useful Life, Years	5
Minimum [Member] | Customer Relationships [Member]
Weighted Average Useful Life, Years	4
Minimum [Member] | Trademarks/Trade Names [Member]
Weighted Average Useful Life, Years	5
Minimum [Member] | Total [Member]
Weighted Average Useful Life, Years	2
Intellectual Property/Developed Technology [Member]
Gross Carrying Amount	$ 145	$ 18
Accumulated Amortization	(14)	(6)
Customer Relationships [Member]
Gross Carrying Amount	55	0
Accumulated Amortization	(3)	0
Trademarks/Trade Names [Member]
Gross Carrying Amount	13	0
Accumulated Amortization	0	0
In-process Research and Development [Member]
Weighted Average Useful Life, Years	5
Gross Carrying Amount	8	0
Accumulated Amortization	0	0
Non-compete Agreements [Member]
Weighted Average Useful Life, Years	2
Gross Carrying Amount	1	0
Accumulated Amortization	0	0
Total [Member]
Gross Carrying Amount	222	18
Accumulated Amortization	$ (17)	$ (6)

X

- Definition

The accumulated amount of amortization of a major finite-lived intangible asset class. A major class is composed of intangible assets that can be grouped together because they are similar, either by their nature or by their use in the operations of a company.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 142
-Paragraph 45
-Subparagraph a(1)
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=6905858&loc=d3e16323-109275

+ Details

Name:	us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Sum of the gross carrying amounts before accumulated amortization as of the balance sheet date of all intangible assets having statutory or estimated useful lives. The aggregate gross carrying amount (including any previously recognized impairment charges) of a major finite-lived intangible asset class. A major class is composed of intangible assets that can be grouped together because they are similar, either by their nature or by their use in the operations of a company.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 142
-Paragraph 45
-Subparagraph a(1)
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=6905858&loc=d3e16323-109275

+ Details

Name:	us-gaap_FiniteLivedIntangibleAssetsGross
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

The useful life of all finite-lived intangible assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 142
-Paragraph 12, 13, 14
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 35
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=6904245&loc=d3e15372-109273

+ Details

Name:	us-gaap_FiniteLivedIntangibleAssetsUsefulLife
Namespace Prefix:	us-gaap
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration