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Fair Value of Financial Investments and Liabilities - Income from Financial Investments Net, Included in Other, Net, Within Other Income (Expense), Net (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Schedule of Investments [Line Items]
Total income from financial investments	$ 3	$ 16
Private Equity Funds [Member]
Schedule of Investments [Line Items]
Realized gains	$ 3	$ 16

X

- Definition

Marketable securities realized gain.

+ References

No definition available.

+ Details

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X

- Definition

The aggregate amount of income from investments (for example, dividends) not considered a component of the entity's core operations.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.7)

-URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688



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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 7

-Article 5

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