Schedule of Accounts Payable and Accrued Expenses (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Accounts Payable and Accrued Liabilities [Line Items]
Trade accounts payable	$ 95	$ 97
Settlement obligations	200	216
Client deposits	150	147
Accrued compensation and benefits	97	144
Other accrued expenses	224	117
Total	$ 766	$ 721