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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, 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
Quarterly Financial Information [Line Items]                      
Total revenues $ 769 $ 666 $ 670 $ 587 $ 740 $ 647 $ 665 $ 613 $ 2,692 $ 2,665 $ 2,362
Gross margin 431 358 379 305 410 361 382 338 1,473 1,491 1,293
Operating income 177 132 147 76 150 143 160 127 532 580 456
Net income $ 112 $ 98 $ 108 $ 59 $ 112 $ 104 $ 112 $ 91 $ 377 $ 419 $ 353
Basic $ 0.69 $ 0.60 $ 0.66 $ 0.36 $ 0.67 $ 0.62 $ 0.66 $ 0.54 $ 2.31 $ 2.49 $ 2.10
Diluted $ 0.68 $ 0.59 $ 0.65 $ 0.35 $ 0.66 $ 0.60 $ 0.65 $ 0.53 $ 2.27 $ 2.44 $ 2.05