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Employee Benefits Stock Options (Details) - Stock Option
$ / shares in Units, shares in Millions, $ in Millions
12 Months Ended
Dec. 31, 2019
USD ($)
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Number of Shares [Roll Forward]  
Outstanding at December 31, 2018 | shares 23.5
Granted | shares 2.8
Forfeited | shares (1.5)
Expired | shares (0.4)
Exercised | shares (4.9)
Outstanding at December 31, 2019 | shares 19.5
Exercisable at December 31, 2019 | shares 14.3
Expected to vest, net of estimated forfeitures at December 31, 2019 | shares 4.9
Share-based Compensation Arrangement by Share-based Payment Award, Option, Weighted Average Exercise Price [Roll Forward]  
Outstanding at December 31, 2018 | $ / shares $ 53.80
Granted | $ / shares 65.87
Forfeited | $ / shares 69.70
Expired | $ / shares 75.64
Exercised | $ / shares 24.06
Outstanding at December 31, 2019 | $ / shares 61.35
Exercisable at December 31, 2019 | $ / shares 58.74
Expected to vest, net of estimated forfeitures at December 31, 2019 | $ / shares $ 68.51
Additional Disclosures [Abstract]  
Outstanding at December 31, 2019, Weighted-Average Remaining Contractual Term 5 years 1 month 9 days
Expected to vest, net of estimated forfeitures at December 31, 2019, Weighted-Average Remaining Contractual Term 4 years 10 days
Expected to vest, net of estimated forfeitures at December 31, 2019, Weighted-Average Remaining Contractual Term 8 years 29 days
Outstanding at December 31, 2019, Aggregate Intrinsic Value | $ $ 238
Exercisable at December 31, 2019, Aggregate Intrinsic Value | $ 224
Expected to vest, net of estimated forfeitures at December 31, 2019, Aggregate Intrinsic Value | $ $ 13