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Impact and Location of AOCI Reclassifications in Consolidated Statements of Income (Detail) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Defined Benefit Plan Disclosure [Line Items]                      
Cost of services                 $ (786) $ (758) $ (688)
Selling, general and administrative expenses                 (757) (728) (663)
Research and development expenses                 (184) (183) (174)
Net income 112 98 108 59 112 104 112 91 377 419 353
Amount Reclassified from of Accumulated Other Comprehensive Income
                      
Defined Benefit Plan Disclosure [Line Items]                      
Net income                 2 2 4
Amount Reclassified from of Accumulated Other Comprehensive Income | Accumulated Defined Benefit Plans Adjustment
                      
Defined Benefit Plan Disclosure [Line Items]                      
Cost of services                 2 1 2
Selling, general and administrative expenses                 1 0 0
Research and development expenses                 $ (1) $ 1 $ 2