Acquisition - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		3 Months Ended
Mar. 31, 2013	Mar. 31, 2012	Jan. 14, 2013	Mar. 31, 2013 Open Solutions Inc	Jan. 14, 2013 Open Solutions Inc
Business Acquisition [Line Items]
Purchase price, net of cash acquired			$ 55		$ 55
Assumption of debt					960
Goodwill			531		531
Revenue	1,152	1,097		60
Non cash impairment charge associated with merger and integration	$ 30			$ 30

Amount of cash paid to acquire the entity.

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Amount of goodwill arising from a business combination, which is the excess of the cost of the acquired entity over the amounts assigned to assets acquired and liabilities assumed.

+ References

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The amount of acquisition cost of a business combination allocated to liabilities assumed.

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-Publisher FASB

-Name Emerging Issues Task Force (EITF)

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of a finite-lived intangible asset to fair value.

+ References

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Aggregate revenue recognized during the period (derived from goods sold, services rendered, insurance premiums, or other activities that constitute an entity's earning process). For financial services companies, also includes investment and interest income, and sales and trading gains.

+ References

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