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Activities Relating to Capitalized Software (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Finite-Lived Intangible Assets [Line Items]
Ending balance	$ 173	$ 140
Internal-Use Software
Finite-Lived Intangible Assets [Line Items]
Beginning balance	11	11	12
Capitalized	6	5	5
Amortization	(5)	(5)	(6)
Ending balance	12	11	11
External-Use Software
Finite-Lived Intangible Assets [Line Items]
Beginning balance	129	105	90
Capitalized	75	63	44
Amortization	(43)	(39)	(29)
Ending balance	$ 161	$ 129	$ 105

For each income statement presented, the amount charged to expense for amortization of capitalized computer software costs.

The carrying amount of capitalized computer software costs net of accumulated amortization as of the balance sheet date.