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Share-Based Incentive Compensation (tables)
 12 Months Ended
Dec. 31, 2017
Share-Based Incentive Compensation disclosure  
Assumptions used in estimating fair value of options on grant date [Table Text Block]

(for the year ended December 31,)
  2017   2016   2015

Assumptions used in estimating fair value of options on grant date

            

Expected term of stock options

   6 years   5 - 6 years   6 years

Expected volatility of Company's stock

   16.50%   15.14% - 16.80%   19.29%

Weighted average volatility

   16.50%   16.79%   19.29%

Expected annual dividend per share

   $2.68   $2.44 - $2.68   $2.20

Risk-free rate

   2.08%   1.36% - 2.23%   1.31%
Additional information regarding option grants [Table Text Block]

(for the year ended December 31,)
  2017   2016   2015

Additional information

  
 		  
 		  
 

Weighted average grant-date fair value of options granted (per share)

   $16.15   $13.29   $15.78

Total intrinsic value of options exercised during the year (in millions)

   $90   $167   $120
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Summary of stock option activity under the Company's 2014 Incentive Plan and legacy share-based incentive compensation plans [Table Text Block]

Stock Options
  Number   Weighted
Average
Exercise
Price		   Weighted
Average
Contractual
Life
Remaining		   Aggregate
Intrinsic
Value
($ in millions)		  

Outstanding, beginning of year

     8,560,036   $ 87.36            

Original grants

     2,106,022     118.78            

Exercised

     (1,784,731 )   73.19            

Forfeited or expired

     (168,860 )   108.25            
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Outstanding, end of year

     8,712,467   $ 97.45   6.9 years   $ 333  
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Vested at end of year(1)

     5,530,589   $ 89.67   6.1 years   $ 254  
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Exercisable at end of year

     2,835,011   $ 70.33   4.2 years   $ 185  
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(1)
Represents awards for which the requisite service has been rendered, including those that are retirement eligible.
Summary of restricted stock units, deferred stock units and performance share activity [Table Text Block]

 
   Restricted and Deferred Stock
Units		   Performance Shares  
Other Equity Instruments
  Number   Weighted Average
Grant-Date
Fair Value		   Number   Weighted Average
Grant-Date
Fair Value		  

Nonvested, beginning of year

     1,376,492   $ 97.75     796,618   $ 106.03  

Granted

     640,913     120.03     393,509     118.78  

Vested

     (662,680 )(1)   90.91     (396,608 )(2)   106.04  

Forfeited

     (67,755 )   109.61     (43,445 )   109.49  

Performance-based adjustment

     —     —     37,658 (3)   110.09  
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Nonvested, end of year

     1,286,970 (4) $ 111.74     787,732   $ 112.40  
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(1)
Represents awards for which the requisite service has been rendered.

(2)
Reflects the number of performance shares attributable to the performance goals attained over the completed performance period (three years) and for which service conditions have been met.

(3)
Represents the current year change in estimated performance shares to reflect the attainment of performance goals for the awards that were granted in each of the years 2015 through 2017.

(4)
95,953 shares of restricted common stock were also issued outside of the 2014 Incentive Plan in connection with the acquisition of Simply Business which remain unvested and are not included in this table. See note 9.