Discontinued Operations - Additional Information (Detail) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Jun. 30, 2013	Feb. 03, 2014 Harris Interactive, Inc.
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Business acquisition price per share of common stock				$ 2.04
Discontinued operation of prepaid expenses and other current assets	$ 19
Discontinued operation of accounts payable and other current liabilities	12
Net proceeds associated with sale of business			950
Gain on sale, net of tax			290
Loss on Shut Down of Business in Discontinued Operations		3
Disposal Group, Including Discontinued Operation, Interest Expense	$ 0	$ 5