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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:                      
Income from continuing operations $ 627 $ 598 $ 494 $ 461 $ 637 $ 584 $ 579 $ 583 $ 2,180 $ 2,383 $ 1,909
Income from discontinued operations 31 38 37 41 31 28 26 23 147 108 85
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:                      
Income from continuing operations $ 1.47 $ 1.40 $ 1.16 $ 1.08 $ 1.50 $ 1.38 $ 1.37 $ 1.37 $ 5.11 $ 5.61 $ 4.52
Income from discontinued operations $ 0.07 $ 0.09 $ 0.09 $ 0.10 $ 0.07 $ 0.06 $ 0.05 $ 0.06 $ 0.35 $ 0.25 $ 0.21
Net income attributable to Company $ 1.54 $ 1.49 $ 1.25 $ 1.18 $ 1.57 $ 1.44 $ 1.42 $ 1.43 $ 5.46 $ 5.86 $ 4.73
Diluted:                      
Income from continuing operations $ 1.47 $ 1.40 $ 1.15 $ 1.07 $ 1.49 $ 1.36 $ 1.35 $ 1.36 $ 5.09 $ 5.58 $ 4.50
Income from discontinued operations $ 0.07 $ 0.09 $ 0.09 $ 0.10 $ 0.07 $ 0.06 $ 0.06 $ 0.06 $ 0.35 $ 0.25 $ 0.20
Net income attributable to Company $ 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