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Employee Benefits - Stock Options (Details) - Stock option
$ / shares in Units, shares in Millions, $ in Millions
12 Months Ended
Dec. 31, 2020
USD ($)
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Number of Shares [Roll Forward]  
Outstanding at December 31, 2019 | shares 19.5
Granted | shares 3.3
Forfeited | shares (0.9)
Expired | shares (0.7)
Exercised | shares (4.6)
Outstanding at December 31, 2020 | shares 16.6
Exercisable at December 31, 2020 | shares 11.6
Expected to vest, net of estimated forfeitures at December 31, 2020 | shares 4.8
Share-based Compensation Arrangement by Share-based Payment Award, Option, Weighted Average Exercise Price [Roll Forward]  
Outstanding at December 31, 2019 | $ / shares $ 61.35
Granted | $ / shares 71.63
Forfeited | $ / shares 72.64
Expired | $ / shares 81.68
Exercised | $ / shares 34.07
Outstanding at December 31, 2020 | $ / shares 69.40
Exercisable at December 31, 2020 | $ / shares 68.85
Expected to vest, net of estimated forfeitures at December 31, 2020 | $ / shares $ 70.70
Additional Disclosures [Abstract]  
Outstanding at December 31, 2020, weighted-average remaining contractual term 5 years 3 months 3 days
Expected to vest, net of estimated forfeitures at December 31, 2020, weighted-average remaining contractual term 3 years 10 months 2 days
Expected to vest, net of estimated forfeitures at December 31, 2020, weighted-average remaining contractual term 8 years 5 months 26 days
Outstanding at December 31, 2020, aggregate intrinsic value | $ $ 70
Exercisable at December 31, 2020, aggregate intrinsic value | $ 70
Expected to vest, net of estimated forfeitures at December 31, 2020, aggregate intrinsic value | $ $ 0