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Long term retention program ("LTRP")
 9 Months Ended
Sep. 30, 2023
Retirement Benefits [Abstract]  
Long term retention program ("LTRP") Long term retention program (“LTRP”)
The following table summarizes the long term retention program accrued compensation expense for the nine and three-month periods ended September 30, 2023 and 2022, which are payable in cash according to the decisions made by the Board of Directors (the “Board”):
Nine Months Ended September 30,Three Months Ended September 30,
2023202220232022
(In millions)(In millions)
LTRP 2017$— $(3)$— $1 
LTRP 20183 (2)1 1 
LTRP 201913 12 4 5 
LTRP 202015 14 5 5 
LTRP 202117 16 5 5 
LTRP 202231 22 9 7 
LTRP 202343 — 15 — 
Total LTRP$122 $59 $39 $24