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Marketable Securities - Changes in Value of Marketable Securities Reported in Current and Non-Current Assets on Consolidated Balance Sheets (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
Schedule of Available-for-sale Securities [Line Items]
Beginning Balance	$ 413		$ 1,124
Amount invested in French, German, Italian and U.S. government bonds	450		352		1,100
Sale/ Settlement	(630)		(818)		(1,219)
Change in fair value included in OCI for available-for-sale marketable securities	6	[1]	(33)	[1]
Change in fair value recognized in earnings	1		9
Realized gain			323
Foreign exchange result through OCI	(2)	[1]	(5)	[1]
Ending Balance	238		413		1,124
Debt securities issued by the U.S. Treasury [Member]
Schedule of Available-for-sale Securities [Line Items]
Beginning Balance	100		350
Amount invested in French, German, Italian and U.S. government bonds	450		100
Sale/ Settlement	(400)		(350)
Ending Balance	150		100
Debt securities issued by foreign governments [Member]
Schedule of Available-for-sale Securities [Line Items]
Beginning Balance	81		213
Amount invested in French, German, Italian and U.S. government bonds			225
Sale/ Settlement	(81)		(355)
Foreign exchange result through OCI			(2)	[1]
Ending Balance			81
Fixed Income Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Beginning Balance	27
Amount invested in French, German, Italian and U.S. government bonds			27
Sale/ Settlement	(25)
Foreign exchange result through OCI	(2)	[1]
Ending Balance			27
Senior debt Floating Rate Notes issued by financial institutions [Member]
Schedule of Available-for-sale Securities [Line Items]
Beginning Balance	205		328
Sale/ Settlement	(124)		(113)
Change in fair value included in OCI for available-for-sale marketable securities	6	[1]	(2)	[1]
Change in fair value recognized in earnings	1		(5)
Foreign exchange result through OCI			(3)	[1]
Ending Balance	88		205
Auction Rate Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Beginning Balance			72
Sale/ Settlement			(350)
Change in fair value included in OCI for available-for-sale marketable securities			(45)	[1]
Realized gain			323
Equity securities classified as available-for-sale [Member]
Schedule of Available-for-sale Securities [Line Items]
Beginning Balance			161
Sale/ Settlement			(189)
Change in fair value included in OCI for available-for-sale marketable securities			14	[1]
Change in fair value recognized in earnings			$ 14
[1] Other Comprehensive Income

X

- Definition

This item represents the pretax change in net unrealized holding gain (loss) on available-for-sale securities that has been included in accumulated other comprehensive income, a separate component of shareholders' equity, during the period.

+ References

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 115

-Paragraph 21

-Subparagraph d

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- Definition

This item represents the difference between the gross realized gains and losses realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. Additionally, this item would include any losses recognized for other than temporary impairments (OTTI) of the subject investments in debt and equity securities.

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-Publisher FASB

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-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.



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Total debt and equity financial instruments including: (1) securities held-to-maturity, (2) trading securities, and (3) securities available-for-sale.

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- Definition

This item represents the total realized gain (loss) included in earnings for the period as a result of selling marketable securities categorized as trading, available-for-sale, or held-to-maturity. Additionally, this item would include any losses recognized for other than temporary impairments (OTTI) of the subject investments in debt and equity securities.

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- Definition

Before tax and net of reclassification adjustments of the change in the balance sheet adjustment that results from the process of translating subsidiary financial statements and foreign equity investments into the reporting currency of the reporting entity. Also includes the following: gain (loss) on foreign currency forward exchange contracts; foreign currency transactions designated as hedges of net investment in a foreign entity and intercompany foreign currency transactions that are of a long-term nature, when the entities to the transaction are consolidated, combined, or accounted for by the equity method in the reporting enterprise's financial statements; and gain (loss) on a derivative instrument or nonderivative financial instrument that may give rise to a foreign currency transaction gain (loss) that has been designated and qualified as a hedging instrument for hedging of the foreign currency exposure of a net investment in a foreign operation.

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The cash outflow from purchases of trading, available-for-sale securities and held-to-maturity securities.

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The cash inflow associated with the aggregate amount received by the entity through sale or maturity of marketable securities (held-to-maturity or available-for-sale) during the period.

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