Deferred Income Tax Assets and Liabilities (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011		Dec. 31, 2010
Deferred tax assets:
Net operating losses	$ 156	[1]	$ 93	[1]
Stock-based compensation	178		101
Assets held for investment	64		61
Deferred revenue	41		3
Accrued liabilities, reserves, & other expenses	412		269
Other items	98		80
Tax credits	7	[2]	14	[2]
Total gross deferred tax assets	956		621
Less valuation allowance	(227)	[3]	(146)	[3]
Deferred tax assets, net of valuation allowance	729		475
Deferred tax liabilities:
Acquisition related intangible assets	(231)		(209)
Depreciation & amortization	(572)		(135)
Other items	(21)		(91)
Net deferred tax assets (liabilities), net of valuation allowance	$ (95)		$ 40

[1] Excluding $129 million and $18 million of deferred tax assets at December 31, 2011 and 2010, related to net operating losses that result from excess stock based compensation.

[2] Excluding $278 million and $231 million of deferred tax assets at December 31, 2011 and 2010, related to tax credits that result from excess stock based compensation.

[3] Relates primarily to deferred tax assets that would only be realizable upon the generation of future capital gains and net income in certain foreign taxing jurisdictions.