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Share-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2020
Share-based Payment Arrangement [Abstract]  
Schedule of share-based compensation activity
A summary of activity for the Company’s Share-Based Awards for the year ended December 31, 2020 is presented below:
Shares or Units
Weighted-Average Grant-Date Fair Value
(per share or unit)
Aggregate Intrinsic Value
(in millions)
Non-vested at December 31, 20191,052,480 $32.55 $36 
Granted2,036,383 15.12 
Vested(508,031)28.36 
Forfeited(126,191)31.65 
Non-vested at December 31, 20202,454,641 $19.01 $37 
A summary of total share based compensation expense and unrecognized compensation expense related to the Share-Based Awards and the Company’s performance awards, the amounts allocated to each of the Company’s segments, and the amounts that were not allocated to segments during the years ended December 31, 2020, 2019, and 2018 is presented below:
ExpensesUnrecognized Expense
For the year ended December 31,At December 31, 2020
(in millions)202020192018AmountWeighted-Average Remaining Years
Share based awards
Incentive Units$3 $12 $4 $26 2.9
Phantom Units1 5 8 7 2.8
Performance awards
CEO Performance Award— — 2 7 1.0
2018 CEO Performance Award— — 2 — 0.0
Former CEO Performance Award— — — — 0.0
Total expense$4 $17 $16 $40