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CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $) In Millions, except Share data, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Statement of Financial Position [Abstract]
Accounts receivable, allowance (in dollars)	$ 42	$ 46
Customer relationships, accumulated amortization	1,843	1,320
Other intangible assets, accumulated amortization	$ 910	$ 704
Common stock, share outstanding (in shares)	1	1

For each balance sheet presented, the amount of accumulated amortization for capitalized computer software costs.

Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.