XML 78 R56.htm IDEA: XBRL DOCUMENT v3.22.0.1
Stock-based compensation (Summary of Stock Options) (Details) - Stock options [Member]
$ / shares in Units, shares in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2021
USD ($)
$ / shares
shares
Options  
Balance unexercised at beginning of period (in shares) | shares 4.7
Granted (in shares) | shares 1.3
Exercised (in shares) | shares (0.5)
Expired/forfeited (in shares) | shares (0.4)
Balance unexercised at end of period (in shares) | shares 5.1
Vested or expected to vest (in shares) | shares 4.9
Exercisable (in shares) | shares 2.0
Weighted- average exercise price  
Balance unexercised at beginning of period (in usd per share) | $ / shares $ 179.90
Granted (in usd per share) | $ / shares 237.17
Exercised (in usd per share) | $ / shares 137.95
Expired/forfeited (in usd per share) | $ / shares 208.56
Balance unexercised at end of period (in shares) | $ / shares 197.27
Weighted-average exercise price, vested or expected to vest (in usd per share) | $ / shares 195.64
Weighted-average exercise price, exercisable (in usd per share) | $ / shares $ 165.46
Stock options information [Abstract]  
Weighted-average remaining contractual life (years), unexercised 7 years 3 months 18 days
Weighted-average remaining contractual life (years), vested or expected to vest 7 years 2 months 12 days
Weighted-average remaining contractual life (years), exercisable 5 years 7 months 6 days
Aggregate intrinsic value, unexercised | $ $ 168
Aggregate intrinsic value, vested or expected to vest | $ 167
Aggregate intrinsic value, exercisable | $ $ 120