Share-Based Compensation - Schedule of Restricted Share Unit and Performance Stock Units Awards (Details) - Restricted Share Unit And Performance Stock Unit Awards [Member] - USD ($)	12 Months Ended
	Dec. 31, 2018		Dec. 31, 2017	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Units issued	2,600,000	[1]	1,400,000	0
Weighted average grant date fair value per unit	$ 59.50	[1]	$ 47.16	$ 0
Fair value of units vested	$ 22,000,000		$ 1,000,000	$ 0

[1] This number excludes 0.2 million performance stock units, which represent the maximum number of common units that would be issued if the maximum level of performance under the target awards amount is achieved.