Supplementary Balance Sheet Data

6 Months Ended

Jun. 30, 2012

Disclosure Text Block Supplement [Abstract]

Supplementary Balance Sheet Data

Supplementary Balance Sheet Data

(in millions)	June 30, 2012		December 31, 2011		June 30, 2011
Accounts receivable — allowance for doubtful accounts	$	52	$	55	$	70
Accounts receivable — allowance for sales returns	120		187		146
Prepublication costs — accumulated amortization	1,120		1,066		955
Property and equipment — accumulated depreciation	1,006		1,066		1,056