Equity-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2020

Share-based Payment Arrangement [Abstract]

Schedule of Shares Awarded

The following table presents the cumulative total number of shares that was awarded under the 2017 Plan and the 2006 Plan for the periods indicated:

	As of December 31,
(In millions)	2020	2019	2018
Total number of shares awarded under the 2006 Plan	68.9	68.9	68.9
Total number of shares awarded under the 2017 Plan	11.3	7.6	3.9

Schedule of Deferred Stock Awards

	Shares (In thousands)	Weighted-Average Grant Date Fair Value
Deferred Stock Awards:
Outstanding as of December 31, 2018	5,975	$	77.07
Granted	3,168	66.68
Vested	(3,089)	71.20
Forfeited	(220)	75.85
Outstanding as of December 31, 2019	5,834	74.33
Granted	2,926	63.56
Vested	(2,938)	71.33
Forfeited	(136)	71.79
Outstanding as of December 31, 2020	5,686	69.70

Schedule of Performance Awards

	Shares (In thousands)	Weighted-Average Grant Date Fair Value
Performance Awards:
Outstanding as of December 31, 2018	2,157	$	69.36
Granted	510	66.04
Forfeited	(96)	74.82
Paid out	(432)	51.01
Outstanding as of December 31, 2019	2,139	71.82
Granted	811	62.58
Forfeited	(23)	94.91
Paid out	(410)	73.10
Outstanding as of December 31, 2020	2,517	68.42