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Shareholders' Equity - Data for stock options issued under the stock incentive plans (Details)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 31, 2017
USD ($)
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]  
Outstanding at January 1, 2017 | shares 4,505,101
Exercised | shares (1,020,986)
Forfeited/Cancelled | shares (16,775)
Outstanding at December 31, 2017 | shares 3,467,340
Options exercisable at December 31, 2017 | shares 2,589,277
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]  
Average exercise price, Beginning balance | $ / shares $ 43.02
Average exercise price, Exercised | $ / shares 33.38
Average exercise price, Forfeited/Cancelled | $ / shares 55.82
Average exercise price, Ending balance | $ / shares 45.80
Average exercise price, Options exercisable | $ / shares $ 42.00
Average remaining contractual term, Options outstanding 4 years 10 months 24 days
Average remaining contractual term, Options exercisable 4 years 4 months 24 days
Aggregate intrinsic value, Options outstanding | $ $ 218
Aggregate intrinsic value, Options exercisable | $ $ 172