Schedule of Intangible Assets by Class (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 3,727	$ 3,179
Accumulated Amortization	1,475	1,435
Net Book Value	2,252	1,744
Customer Related Intangible Assets
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	2,155	1,695
Accumulated Amortization	564	534
Net Book Value	1,591	1,161
Acquired Software And Technology
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	483	378
Accumulated Amortization	238	222
Net Book Value	245	156
Trade Names
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	120	114
Accumulated Amortization	31	29
Net Book Value	89	85
Capitalized Software Development Costs
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	655	667
Accumulated Amortization	405	398
Net Book Value	250	269
Purchased software
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	314	325
Accumulated Amortization	237	252
Net Book Value	$ 77	$ 73