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CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $) In Millions, except Share data, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
CONSOLIDATED BALANCE SHEETS
Accounts receivable, allowance (in dollars)	$ 39	$ 46
Customer relationships, accumulated amortization	1,672	1,320
Other intangible assets, accumulated amortization	$ 829	$ 704
Common stock, share outstanding	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.