Annual report [Section 13 and 15(d), not S-K Item 405]

ASSET RETIREMENT OBLIGATIONS (Tables)

v3.25.0.1
ASSET RETIREMENT OBLIGATIONS (Tables)
12 Months Ended
Dec. 31, 2024
Environmental Remediation Obligations [Abstract]  
Schedule of Asset Retirement Obligations
The following is a summary of our asset retirement obligations:
December 31,
(In millions) 2024 2023
Asset retirement obligations1
$ 526  $ 459 
Less: current portion 25  15 
Long-term asset retirement obligations $ 501  $ 444 
1 Includes $302 million and $259 million related to our active operations as of December 31, 2024 and 2023, respectively.
Roll-forward of Asset Retirement Obligation Liability
The following is a roll-forward of our asset retirement obligation:
(In millions) 2024 2023
Asset retirement obligation as of January 1 $ 459  $ 520 
Increase from Stelco Acquisition 20  — 
Decrease from sale of business   (76)
Accretion expense 22  26 
Remediation payments (33) (21)
Revision in estimated cash flows 58  10 
Asset retirement obligation as of December 31 $ 526  $ 459 
Schedule of Environmental Obligations
The following is a summary of our environmental obligations:
December 31,
(In millions) 2024 2023
Environmental obligations $ 114  $ 134 
Less: current portion 14  21 
Long-term environmental obligations $ 100  $ 113