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Stock-Based Compensation Programs (Details)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2019
USD ($)
installment
$ / shares
shares
Dec. 31, 2018
USD ($)
$ / shares
shares
Dec. 31, 2017
USD ($)
$ / shares
Stock option and SSARs      
Stock-Based Compensation Programs      
Number of equal installments commencing one year from the date of grant | installment 4    
Vesting period 1 year    
Expiration period of options 10 years    
Outstanding Options, Number of Shares      
Beginning of year (in shares) | shares 15,175,811    
Granted (in shares) | shares 1,624,395    
Exercised (in shares) | shares (4,173,273)    
Canceled/forfeited (in shares) | shares (241,473)    
End of the period (in shares) | shares 12,385,460 15,175,811  
Vested and exercisable, end of period (in shares) | shares 7,957,900    
Reserved for future grants (in shares) | shares 19,641,712    
Outstanding Options, Weighted Average Exercise Price      
Beginning of year (in dollars per share) | $ / shares $ 27.45    
Granted (in dollars per share) | $ / shares 51.42    
Exercised (in dollars per share) | $ / shares 21.19    
Canceled/forfeited (in dollars per share) | $ / shares 42.13    
End of period (in dollars per share) | $ / shares 32.41 $ 27.45  
Vested and exercisable, end of period (in dollars per share) | $ / shares $ 26.82    
Additional disclosures      
Weighted average remaining contractual term of options outstanding 5 years 6 months    
Aggregate intrinsic value of options outstanding | $ $ 400.0    
Weighted average remaining contractual term of options vested and exercisable 4 years 1 month 6 days    
Aggregate intrinsic value of options vested and exercisable | $ $ 301.0    
Total fair value of options vested | $ $ 16.0 $ 16.0 $ 14.0
Weighted average fair value at grant date (in dollars per share) | $ / shares $ 12.26 $ 9.07 $ 7.82
Stock options      
Additional disclosures      
Cash received from options exercised | $ $ 41.0 $ 29.0 $ 21.0
Intrinsic value of options exercised | $ 61.0 $ 30.0 $ 26.0
Tax benefit from exercise of options | $ $ 35.0    
Restricted shares and restricted stock units      
Stock-Based Compensation Programs      
Vesting period 5 years    
PCEQs      
Stock-Based Compensation Programs      
Vesting period 3 years