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Share-Based Incentive Compensation (Tables)
 12 Months Ended
Dec. 31, 2021
Share-based Payment Arrangement [Abstract]  
Assumptions used in estimating fair value of options on grant date [Table Text Block] The following table provides information about options granted:
(for the year ended December 31,)202120202019
Assumptions used in estimating fair value of options on grant date
Expected term of stock options6 years6 years6 years
Expected volatility of Company’s stock
24.22% - 24.53%
15.73 %
15.47% - 15.91%
Weighted average volatility24.22 %15.73 %15.48 %
Expected annual dividend per share
$3.40 - $3.52
$3.28
$3.08 - $3.28
Risk-free rate
0.59% - 1.08%
1.37 %
1.70% - 2.54%
Additional information
Weighted average grant-date fair value of
 options granted (per share)
$23.32 $14.41 $16.64 
Total intrinsic value of options exercised
 during the year (in millions)
$94 $47 $88 
Additional information regarding option grants [Table Text Block] The following table provides information about options granted:
(for the year ended December 31,)202120202019
Assumptions used in estimating fair value of options on grant date
Expected term of stock options6 years6 years6 years
Expected volatility of Company’s stock
24.22% - 24.53%
15.73 %
15.47% - 15.91%
Weighted average volatility24.22 %15.73 %15.48 %
Expected annual dividend per share
$3.40 - $3.52
$3.28
$3.08 - $3.28
Risk-free rate
0.59% - 1.08%
1.37 %
1.70% - 2.54%
Additional information
Weighted average grant-date fair value of
 options granted (per share)
$23.32 $14.41 $16.64 
Total intrinsic value of options exercised
 during the year (in millions)
$94 $47 $88 
Summary of stock option activity under the Company's 2014 Incentive Plan and legacy share-based incentive compensation plans [Table Text Block]
A summary of stock option activity under the 2014 Incentive Plan and the legacy plans as of and for the year ended December 31, 2021 is as follows:
Stock OptionsNumberWeighted
Average
Exercise
Price		Weighted
Average
Contractual
Life
Remaining		Aggregate
Intrinsic
Value
($ in millions)
Outstanding, beginning of year10,075,758 $121.03 
Original grants1,599,841 139.88 
Exercised(2,181,586)110.39 
Forfeited or expired(74,128)131.29 
Outstanding, end of year9,419,885 $126.62 6.5 years$281 
Vested at end of year (1)
7,225,469 $124.73 6.0 years$229 
Exercisable at end of year4,081,500 $118.75 4.4 years$154 
___________________________________________
(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]
A summary of restricted stock units, deferred stock units and performance share activity under the 2014 Incentive Plan and the legacy plans as of and for the year ended December 31, 2021 is as follows:
Restricted and Deferred Stock
Units		Performance Shares
Other Equity InstrumentsNumberWeighted
Average
Grant-Date
Fair Value		NumberWeighted Average
Grant-Date Fair
Value
Nonvested, beginning of year1,086,784 $132.12 723,991 $129.45 
Granted605,188 141.22 367,299 139.83 
Vested(513,226)(1)138.57 (359,925)(2)126.18 
Forfeited(69,921)132.93 (24,828)131.20 
Performance-based adjustment— — 224,020 (3)138.56 
Nonvested, end of year1,108,825 $134.05 930,557 $136.96 
___________________________________________
(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 2019 through 2021.