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Incentive Plans (Tables)
 3 Months Ended
Mar. 31, 2023
Share-Based Payment Arrangement [Abstract]  
Schedule of stock-based compensation expense
Stock-based compensation expense for restricted stock awards and units expected to be settled in the Company's common stock ("Equity Awards"), restricted stock units expected to be settled in cash ("Liability Awards") and performance units ("Performance Awards") issued under both the LTIP and the Company's Employee Stock Purchase Plan ("ESPP") are as follows:
 
Three Months Ended March 31,
 20232022
 (in millions)
Equity Awards
$13 $11 
Liability Awards (a)
3 9 
Performance Awards
9 7 
ESPP
1 1 
$26 $28 
Capitalized stock-based compensation expense$4 $5 
______________________
(a)Liability Awards are expected to be settled on their vesting date in cash. As of March 31, 2023 and December 31, 2022, accounts payable – due to affiliates included $9 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:
Three Months Ended March 31, 2023
Equity Awards
Liability Awards
Performance Awards
Beginning awards481,293 119,695 268,003 
Awards granted98,301 2,902 83,727 
Awards forfeited(3,592)(1,758)— 
Awards vested (a)(75,019)(1,875)(5,566)
Ending awards500,983 118,964 346,164 
______________________
(a)Per the terms of award agreements and elections, the issuance of common stock may be deferred for certain Equity Awards that vest during the period.