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Quarterly Financial Data - Quarterly Financial 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
Schedule Of Quarterly Financial Information [Line Items]                      
Revenues $ 5,685 $ 5,319 $ 4,734 $ 4,303 $ 4,259 $ 3,740 $ 3,513 $ 3,146 $ 20,041 $ 14,658 $ 12,156
Gross profit 1,395 1,371 1,306 1,267 1,275 1,164 1,083 975 5,339 4,497 3,832
Net income attributable to Company $ 668 $ 612 $ 605 $ 606 $ 574 $ 532 $ 481 $ 407 $ 2,491 $ 1,994 $ 1,667
Net income attributable to Company per basic share $ 1.57 $ 1.44 $ 1.42 $ 1.43 $ 1.36 $ 1.26 $ 1.14 $ 0.97 $ 5.86 $ 4.73 $ 3.99
Net income attributable to Company per diluted share $ 1.56 $ 1.43 $ 1.42 $ 1.42 $ 1.35 $ 1.25 $ 1.13 $ 0.96 $ 5.83 $ 4.70 $ 3.98
Cash dividends per share $ 0.13 $ 0.12 $ 0.12 $ 0.12 $ 0.12 $ 0.11 $ 0.11 $ 0.11 $ 0.49 $ 0.45 $ 0.41