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Employee Benefits - Stock Options (Details) - Stock option
$ / shares in Units, shares in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2021
USD ($)
$ / shares
shares
Shares (in millions)  
Outstanding, beginning balance (in shares) | shares 16.6
Granted (in shares) | shares 3.8
Forfeited (in shares) | shares (0.9)
Expired (in shares) | shares (1.1)
Exercised (in shares) | shares (1.6)
Outstanding, beginning balance (in shares) | shares 16.8
Exercisable (in shares) | shares 11.2
Expected to vest, net of estimated forfeitures (in shares) | shares 5.3
Weighted- Average Exercise Price (in dollars)  
Outstanding, beginning balance (in dollars per share) | $ / shares $ 69.40
Granted (in dollars per share) | $ / shares 64.77
Forfeited (in dollars per share) | $ / shares 67.67
Expired (in dollars per share) | $ / shares 82.11
Exercised (in dollars per share) | $ / shares 37.46
Outstanding, ending balance (in dollars per share) | $ / shares 70.60
Exercisable (in dollars per share) | $ / shares 72.43
Expected to vest, net of estimated forfeitures (in dollars per share) | $ / shares $ 67.01
Weighted-Average Remaining Contractual Term (years)  
Outstanding 5 years 4 months 2 days
Exercisable 3 years 8 months 1 day
Expected to vest, net of estimated forfeitures 8 years 7 months 9 days
Aggregate Intrinsic Value (in millions)  
Outstanding | $ $ 101
Exercisable | $ 68
Expected to vest, net of estimated forfeitures | $ $ 32