Share-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2020

Share-based Payment Arrangement [Abstract]

Schedule of Share-based Compensation Expense, Net

Total share-based compensation consisted of the following (in millions):

	Year Ended December 31,
	2020		2019		2018
Share-based compensation costs, pre-tax:
Equity awards	$	114	$	131	$	89
Liability awards	2		9		48
Total share-based compensation	116		140		137
Capitalized share-based compensation	(6)		(9)		(24)
Total share-based compensation expense	$	110	$	131	$	113
Tax benefit associated with share-based compensation expense	$	23	$	14	$	6

Share-based Payment Arrangement, Nonvested Award, Cost

The total unrecognized compensation cost at December 31, 2020 relating to non-vested share-based compensation arrangements consisted of the following:

	Unrecognized Compensation Cost (in millions)		Recognized over a weighted average period (years)
Restricted Stock Share Awards	$	1	0.3
Restricted Stock Unit and Performance Stock Unit Awards	$	111	1.3
Phantom Units Awards	$	—	0.2

Nonvested Restricted Stock Shares Activity

The table below provides a summary of our restricted stock outstanding (in millions, except for per share information):

	Shares	Weighted Average Grant Date Fair Value Per Share
Non-vested at January 1, 2020	0.0	$	67.79
Granted	0.1	41.78
Vested	0.0	—
Forfeited	0.0	—
Non-vested at December 31, 2020	0.1	$	41.78

Schedule of Nonvested Share Activity

The table below provides a summary of our restricted share unit and performance stock unit awards outstanding assuming payout at target for awards containing performance conditions (in millions, except for per unit information):

	Units	Weighted Average Grant Date Fair Value Per Unit
Non-vested at January 1, 2020	4.4	$	61.68
Granted (1)	1.8	53.88
Vested	(2.3)	58.49
Forfeited	(0.2)	58.83
Non-vested at December 31, 2020 (2)	3.7	$	60.00

(1)     This number includes 0.2 million incremental shares of our common stock that were issued based on performance results from previously-granted performance stock unit awards.

(2)     This number excludes 1.0 million performance stock units, which represent the incremental number of common units that would be issued if the maximum level of performance under the target awards amount is achieved.

Share-based Compensation, Restricted Stock Units And Performance Shares Award Issued And Vested

The table below provides a summary of restricted share unit and performance stock unit awards issued and fair value of units vested:

	Year Ended December 31,
	2020		2019		2018
Units issued (in millions)	1.8		1.9		2.6
Weighted average grant date fair value per unit	$	53.88	$	67.47	$	59.50
Fair value of units vested (in millions)	$	137	$	45	$	22

Nonvested Phantom Units Activity

The table below provides a summary of our phantom units outstanding (in millions):

	Units
Non-vested at January 1, 2020	0.1
Granted	—
Vested	(0.1)
Forfeited	0.0
Non-vested at December 31, 2020	0.0