Annual report pursuant to Section 13 and 15(d)

Share-Based Compensation - Schedule of Restricted Share Unit and Performance Stock Units Awards (Details)

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Share-Based Compensation - Schedule of Restricted Share Unit and Performance Stock Units Awards (Details) - Restricted Share Unit And Performance Stock Unit Awards [Member] - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Units issued 1.9 2.6 1.4
Weighted average grant date fair value per unit $ 67.47 $ 59.50 $ 47.16
Fair value of units vested $ 45 $ 22 $ 1