Significant Components of Deferred Tax Assets and Liabilities (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Deferred tax assets:
Stock-based compensation expense	$ 311	$ 288
State taxes	184	138
Capital loss carryforward	236	285
Settlement with the Authors Guild and AAP	28	35
Vacation accruals	67	52
Deferred rent	50	43
Accruals and reserves not currently deductible	688	268
Acquired net operating losses	505	156
Tax credit	274	55
Basis difference in Investment in Home business	2,043	0
Other	128	11
Total deferred tax assets	4,514	1,331
Valuation allowance	(2,629)	(333)
Total deferred tax assets net of valuation allowance	1,885	998
Deferred tax liabilities:
Depreciation and amortization	(761)	(479)
Identified intangibles	(1,496)	(398)
Unrealized gains on investments and other	(105)	(90)
Other prepaids	(118)	(70)
Other	(133)	(33)
Total deferred tax liabilities	(2,613)	(1,070)
Net deferred tax liabilities	$ (728)	$ (72)