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Summary of Significant Accounting Policies - Computation of Weighted Average Basic and Diluted Shares Outstanding (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
Numerator:                      
Net income attributable to Company $ 658 $ 636 $ 531 $ 502 $ 668 $ 612 $ 605 $ 606 $ 2,327 $ 2,491 $ 1,994
Denominator:                      
Basic-weighted average common shares outstanding                 426 425 422
Dilutive effect of employee stock options and other unvested stock awards                 2 2 2
Diluted outstanding shares                 428 427 424
Basic earnings attributable to Company per share $ 1.54 $ 1.49 $ 1.25 $ 1.18 $ 1.57 $ 1.44 $ 1.42 $ 1.43 $ 5.46 $ 5.86 $ 4.73
Diluted earnings attributable to Company per share $ 1.53 $ 1.49 $ 1.24 $ 1.17 $ 1.56 $ 1.43 $ 1.42 $ 1.42 $ 5.44 $ 5.83 $ 4.70
Cash dividends per share $ 0.26 $ 0.26 $ 0.26 $ 0.13 $ 0.13 $ 0.12 $ 0.12 $ 0.12 $ 0.91 $ 0.49 $ 0.45