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Quarterly Information (Detail) (USD $)
In Millions, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Quarterly Financial Information [Line Items]                      
Total revenues $ 740 $ 647 $ 665 $ 613 $ 673 $ 602 $ 581 $ 506 $ 2,665 $ 2,362 $ 1,936
Gross margin 410 361 382 338 374 328 316 275 1,491 1,293 1,088
Operating income 150 143 160 127 133 122 110 91 580 456 415
Net income $ 112 $ 104 $ 112 $ 91 $ 98 $ 87 $ 103 $ 65 $ 419 $ 353 $ 301
Basic $ 0.67 $ 0.62 $ 0.66 $ 0.54 $ 0.59 $ 0.52 $ 0.61 $ 0.39 $ 2.49 $ 2.10 $ 1.80
Diluted $ 0.66 $ 0.60 $ 0.65 $ 0.53 $ 0.57 $ 0.51 $ 0.60 $ 0.38 $ 2.44 $ 2.05 $ 1.77