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Long term retention program ("LTRP")
 6 Months Ended
Jun. 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 six and three-month periods ended June 30, 2023 and 2022, which are payable in cash according to the decisions made by the Board of Directors (the “Board”):
Six Months Ended June 30,Three Months Ended June 30,
2023202220232022
(In millions)(In millions)
LTRP 2017$— $(4)$— $(3)
LTRP 20182 (3)— (3)
LTRP 20199 7 4 1 
LTRP 202010 9 4 2 
LTRP 202112 11 5 3 
LTRP 202222 15 9 5 
LTRP 202328 — 14 — 
Total LTRP$83 $35 $36 $5