Description Of Business And Summary Of Significant Accounting Policies (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended			12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2012
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Current and prior years fiscal period (in weeks)				52	52	52
Capitalized internal-use software	$ 74	$ 81		$ 74	$ 81
Impairment charges	1	31	6		39	12
Vendor reimbursements of advertising costs				66	45	39
Advertising expense, net of vendor reimbursements				217	240	321
Net gains (losses) on foreign currency transactions				4	2	(29)
Deferred Tax Liabilities, Other	9	11		9	11
Minimum [Member]
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Fiscal year (in weeks)				52
Acquired intangible assets estimated useful life				2 years
Maximum [Member]
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Acquired intangible assets estimated useful life				14 years
Building | Minimum [Member]
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Property and equipment estimated useful life				20 years
Building | Maximum [Member]
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Property and equipment estimated useful life				25 years
Computer equipment and software | Minimum [Member]
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Property and equipment estimated useful life				3 years
Computer equipment and software | Maximum [Member]
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Property and equipment estimated useful life				6 years
Furniture And Equipment [Member] | Minimum [Member]
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Property and equipment estimated useful life				3 years
Furniture And Equipment [Member] | Maximum [Member]
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Property and equipment estimated useful life				5 years
Warehouse Equipment and Other [Member] | Minimum [Member]
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Property and equipment estimated useful life				5 years
Warehouse Equipment and Other [Member] | Maximum [Member]
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Property and equipment estimated useful life				5 years
Leasehold Improvements [Member] | Minimum [Member]
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Property and equipment estimated useful life				1 year
Leasehold Improvements [Member] | Maximum [Member]
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Property and equipment estimated useful life				10 years
Internal-Use Software [Member]
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Capitalized internal-use software estimated useful life				3 years
Acquisition Related Intangibles [Member] | Minimum [Member]
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Acquired intangible assets estimated useful life				2 years
Acquisition Related Intangibles [Member] | Maximum [Member]
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Acquired intangible assets estimated useful life				14 years
Credit Concentration Risk [Member] | Accounts Receivable [Member]
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Entity wide gross receivables by major customer percent of gross receivables did not exceed ten percent				10.00%
Customer Concentration Risk [Member] | Sales Revenue, Goods, Net [Member]
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Concentration risk, percentage				68.00%
Sales Revenue, Product Line [Member] | Product Concentration Risk [Member]
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Concentration risk, percentage				55.00%	60.00%	61.00%
Cost of revenue [Member]
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Impairment charges					34
Amortization of intangibles [Member]
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Impairment charges					5
Restructuring and other charges and research and development expenses [Member]
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Impairment charges						$ 12
Customer A [Member] | Credit Concentration Risk [Member] | Accounts Receivable [Member]
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Concentration risk, percentage				17.00%	13.00%
Customer B [Member] | Credit Concentration Risk [Member] | Accounts Receivable [Member]
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Concentration risk, percentage				11.00%	10.00%
Customer C [Member] | Credit Concentration Risk [Member] | Accounts Receivable [Member]
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Concentration risk, percentage				15.00%