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Quarterly Financial Data (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2010
Sep. 30, 2010
Jun. 30, 2010
Mar. 31, 2010
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Selected Quarterly Financial Information [Abstract]                      
Revenues $ 4,259 $ 3,740 $ 3,513 $ 3,146 $ 3,172 $ 3,011 $ 2,941 $ 3,032 $ 14,658 $ 12,156 $ 12,712
Gross profit 1,275 1,164 1,083 975 997 945 928 962 4,497 3,832 3,784
Net income attributable to Company $ 574 $ 532 $ 481 $ 407 $ 440 $ 404 $ 401 $ 422 $ 1,994 $ 1,667 $ 1,469
Net income attributable to Company per basic share $ 1.36 $ 1.26 $ 1.14 $ 0.97 $ 1.05 $ 0.97 $ 0.96 $ 1.01 $ 4.73 $ 3.99 $ 3.53
Net income attributable to Company per diluted share $ 1.35 $ 1.25 $ 1.13 $ 0.96 $ 1.05 $ 0.96 $ 0.96 $ 1.01 $ 4.70 $ 3.98 $ 3.52
Cash dividends per share $ 0.12 $ 0.11 $ 0.11 $ 0.11 $ 0.11 $ 0.10 $ 0.10 $ 0.10 $ 0.45 $ 0.41 $ 1.10