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Incentive Plans (Tables)
 9 Months Ended
Sep. 30, 2023
Share-Based Payment Arrangement [Abstract]  
Schedule of stock-based compensation expense
Share-based compensation expense for (i) restricted stock awards and units expected to be settled in the Company's common shares ("Equity Awards"), (ii) restricted stock units expected to be settled in cash ("Liability Awards"), (iii) performance units ("Performance Awards") issued under the LTIP and (iv) shares issued under the Company's Employee Stock Purchase Plan ("ESPP") are as follows:
 Three Months Ended September 30,
Nine Months Ended September 30,
 2023202220232022
 (in millions)
Equity Awards (a)
$13 $11 $42 $33 
Liability Awards (b)
5 6 11 17 
Performance Awards (a)
6 8 25 24 
ESPP
1 1 3 2 
$25 $26 $81 $76 
Capitalized share-based compensation expense$5 $5 $14 $14 
______________________
(a)In February 2023, the Company changed the retirement eligibility provisions for 2023 share-based compensation awards issued to officers, which shortened the requisite service period over which the expense is recognized.
(b)Liability Awards are expected to be settled on their vesting date in cash. As of September 30, 2023 and December 31, 2022, accounts payable – due to affiliates included $2 million and $6 million, respectively, of liabilities attributable to Liability Awards.
Schedule of equity awards, liability awards, performance awards and stock options
Activity for Equity Awards, Liability Awards, and Performance Awards is as follows:
Nine Months Ended September 30, 2023
Equity Awards
Liability Awards
Performance Awards (a)
Beginning awards481,293 119,695 268,003 
Awards granted279,615 54,599 83,727 
Awards forfeited(10,685)(6,576)(153)
Awards vested (b)
(250,633)(64,860)(6,183)
Ending awards499,590 102,858 345,394 
______________________
(a)Reflects the number of performance units initially granted assuming a target payout percentage. In accordance with the Merger Agreement, outstanding Performance Awards are expected to vest at their maximum payout percentage.
(b)Per the terms of award agreements and elections, the issuance of common shares may be deferred for certain Equity Awards that vest during the period.