Summary of Significant Accounting Policies - Accounting Policies, Text Amounts (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010
Accounting Policies [Abstract]
Amortization of customer-related contract costs	$ 294	$ 134
Weighted average life, deferred set-up customer costs	8
Amortization expense, customer contract costs	80
Long-term Revenue Recognition, Percentage of Completion	$ 320	$ 270
Revenue Recognition, Multipledeliverable Arrangements, Percentage	40.00%

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Deferred incremental direct costs incurred typically at a contract's inception so that the company may be in a position to fulfill all contractual obligations of an arrangement. The costs are directly related to specified activities under the arrangement and are deferred in order to match revenue that will be recognized within one year of the balance sheet date (or one operating cycle if longer).

+ References

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

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 13

-Section A

-Subsection 3

-Paragraph f

-Subparagraph Question 3, 4

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.8)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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- Definition

Amortization expense, customer contract costs

+ References

No definition available.

+ Details

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- Definition

Long-term Revenue Recognition, Percentage of Completion - revenue recognized under the percentage-of-completion method for long-term contracts.

+ References

No definition available.

+ Details

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- Definition

Revenue Recognition, Multiple-deliverable Arrangements, Percentage

+ References

No definition available.

+ Details

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- Definition

Weighted-average Life, Services Revenue, Deferred Set-up Costs -the weighted-average amortization period for set-up, transition and incudement costs related to service contracts.

+ References

No definition available.

+ Details

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