Schedule II: Valuation and Qualifying Accounts Schedule II: Valuation and Qualifying Accounts (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2011
Movement in Valuation Allowances and Reserves [Roll Forward]
Valuation Allowances and Reserves, Additions/Charged to Expense	$ 31
Valuation Allowances and Reserves, Deductions	10
Valuation Allowances and Reserves, Ending Balance	73				82
Allowance for Trade Receivables [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Valuation Allowances and Reserves, Beginning Balance							154	[1]
Valuation Allowances and Reserves, Ending Balance	188	[1]			252	[1]	154	[1]
Accounts Receivable Allowances [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Valuation Allowances and Reserves, Additions/Charged to Expense	1,379	[1]	2,867	[1]	1,870	[1]
Valuation Allowances and Reserves, Deductions	1,345	[1]	2,763	[1]	1,806	[1]
Valuation Allowances and Reserves, Ending Balance			356	[1]
Allowance for Sales Returns [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Valuation Allowances and Reserves, Beginning Balance			82		73		52
Valuation Allowances and Reserves, Additions/Charged to Expense			104		21
Valuation Allowances and Reserves, Deductions			15		12
Valuation Allowances and Reserves, Ending Balance			171		82		52
Valuation Allowance of Deferred Tax Assets [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Valuation Allowances and Reserves, Beginning Balance	9	[2]	9	[2]	9	[2]
Valuation Allowances and Reserves, Additions/Charged to Expense	0	[2]	0	[2]	0	[2]
Valuation Allowances and Reserves, Deductions	0	[2]	0	[2]	0	[2]
Valuation Allowances and Reserves, Ending Balance	$ 9	[2]	$ 9	[2]	$ 9	[2]

[1] Allowances are for doubtful accounts, cash discounts and chargebacks.

[2] Valuation allowance for deferred tax assets includes $6 million and $7 million as of December 31, 2014 and 2013, respectively, related to our acquisitions.