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Employee Benefits - Stock Options (Details) - Stock Option
$ / shares in Units, shares in Thousands, $ in Millions
12 Months Ended
Dec. 31, 2018
USD ($)
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Number of Shares [Roll Forward]  
Outstanding at December 31, 2017 | shares 30,220
Granted | shares 3,659
Forfeited | shares (1,943)
Expired | shares (284)
Exercised | shares (8,128)
Outstanding at December 31, 2018 | shares 23,524
Exercisable at December 31, 2018 | shares 15,521
Expected to vest, net of estimated forfeitures at December 31, 2018 | shares 7,629
Share-based Compensation Arrangement by Share-based Payment Award, Option, Weighted Average Exercise Price [Roll Forward]  
Outstanding at December 31, 2017 | $ / shares $ 43.93
Granted | $ / shares 79.49
Forfeited | $ / shares 70.23
Expired | $ / shares 71.09
Exercised | $ / shares 24.16
Outstanding at December 31, 2018 | $ / shares 53.80
Exercisable at December 31, 2018 | $ / shares 45.67
Expected to vest, net of estimated forfeitures at December 31, 2018 | $ / shares $ 69.34
Additional Disclosures [Abstract]  
Outstanding at December 31, 2017, Weighted-Average Remaining Contractual Term 5 years 7 months 17 days
Expected to vest, net of estimated forfeitures at December 31, 2017, Weighted-Average Remaining Contractual Term 4 years 2 months 15 days
Expected to vest, net of estimated forfeitures at December 31, 2017, Weighted-Average Remaining Contractual Term 8 years 4 months 13 days
Outstanding at December 31, 2017, Aggregate Intrinsic Value | $ $ 417
Exercisable at December 31, 2017, Aggregate Intrinsic Value | $ 372
Expected to vest, net of estimated forfeitures at December 31, 2017, Aggregate Intrinsic Value | $ $ 43