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Capital Stock and Stock-Based Compensation Plans - Summary of Stock Option Activity (Details)
$ / shares in Units, shares in Thousands, $ in Millions
 12 Months Ended
Dec. 31, 2021
USD ($)
$ / shares
shares
Shares (in thousands)  
Options - beginning balance (in shares) | shares 27,530
Granted (in shares) | shares 5,120
Exercised (in shares) | shares (6,358)
Forfeited (in shares) | shares (173)
Expired (in share) | shares (24)
Options - ending balance (in shares) | shares 26,095
Options exercisable (in shares) | shares 16,725
Weighted Average Exercise Price  
Options - beginning of period (in dollars per share) | $ / shares $ 71
Options - shares granted (in dollars per share) | $ / shares 77
Options - shares exercised (in dollars per share) | $ / shares 68
Options - shares forfeited (in dollars per share) | $ / shares 75
Options - shares expired (in dollars per share) | $ / shares 73
Options - end of period (in dollars per share) | $ / shares 72
Options exercisable - end of period (in dollars per share) | $ / shares $ 72
Weighted average remaining contractual life, options outstanding (in years) 5 years
Weighted average remaining contractual life, options exercisable (in years) 3 years
Intrinsic value of unexercised in-the-money options, options outstanding | $ $ 309
Intrinsic value of unexercised in-the-money options, options exercisable | $ $ 223