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

PENSION AND OTHER POSTRETIREMENT BENEFITS - Obligations and Funded Status (Details)

v3.25.0.1
PENSION AND OTHER POSTRETIREMENT BENEFITS - Obligations and Funded Status (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Amounts recognized in Statements of Financial Position: Ìý Ìý Ìý
Pension and OPEB assets $ 427 $ 329 Ìý
Non-current liabilities (751) (821) Ìý
Amounts recognized in accumulated other comprehensive loss (income): Ìý Ìý Ìý
Accumulated benefit obligation 4,236 4,557 Ìý
Pension Benefits Ìý Ìý Ìý
Change in benefit obligations: Ìý Ìý Ìý
Benefit obligations — beginning of year 4,571 4,646 Ìý
Service cost 28 31 $ 45
Interest cost 218 235 144
Plan amendments 0 3 Ìý
Actuarial loss (gain) (165) 116 Ìý
Benefits paid (429) (436) Ìý
Participant contributions 0 0 Ìý
Acquired through business combinations 35 0 Ìý
Foreign currency exchange (1) 0 Ìý
Effect of settlement (9) (24) Ìý
Other 0 0 Ìý
Benefit obligations — end of year 4,248 4,571 4,646
Change in plan assets: Ìý Ìý Ìý
Fair value of plan assets — beginning of year 4,282 4,338 Ìý
Actual return on plan assets 254 375 Ìý
Participant contributions 0 0 Ìý
Employer contributions 119 29 Ìý
Benefits paid (429) (436) Ìý
Acquired through business combinations 21 0 Ìý
Defined Benefit Plan, Plan Assets, Foreign Currency Translation Gain (Loss) (1) 0 Ìý
Effect of settlement (9) (24) Ìý
Fair value of plan assets — end of year 4,237 4,282 4,338
Funded status (11) (289) Ìý
Amounts recognized in Statements of Financial Position: Ìý Ìý Ìý
Pension and OPEB assets 239 137 Ìý
Current liabilities (7) (18) Ìý
Non-current liabilities (243) (408) Ìý
Total amount recognized (11) (289) Ìý
Amounts recognized in accumulated other comprehensive loss (income): Ìý Ìý Ìý
Net actuarial gain (400) (304) Ìý
Prior service cost (credit) 89 106 Ìý
Net amount recognized (311) (198) Ìý
Pension Benefits | Stelco Holdings Inc Ìý Ìý Ìý
Change in benefit obligations: Ìý Ìý Ìý
Benefit obligations — end of year 14 Ìý Ìý
OPEB Ìý Ìý Ìý
Change in benefit obligations: Ìý Ìý Ìý
Benefit obligations — beginning of year 1,036 1,233 Ìý
Service cost 8 10 35
Interest cost 50 64 72
Plan amendments 7 8 Ìý
Actuarial loss (gain) 162 (158) Ìý
Benefits paid (155) (163) Ìý
Participant contributions 36 42 Ìý
Acquired through business combinations 0 0 Ìý
Foreign currency exchange 0 0 Ìý
Effect of settlement 0 0 Ìý
Other 3 0 Ìý
Benefit obligations — end of year 1,147 1,036 1,233
Change in plan assets: Ìý Ìý Ìý
Fair value of plan assets — beginning of year 739 728 Ìý
Actual return on plan assets 46 67 Ìý
Participant contributions 36 42 Ìý
Employer contributions 76 65 Ìý
Benefits paid (155) (163) Ìý
Acquired through business combinations 0 0 Ìý
Defined Benefit Plan, Plan Assets, Foreign Currency Translation Gain (Loss) 0 0 Ìý
Effect of settlement 0 0 Ìý
Fair value of plan assets — end of year 742 739 $ 728
Funded status (405) (297) Ìý
Amounts recognized in Statements of Financial Position: Ìý Ìý Ìý
Pension and OPEB assets 188 192 Ìý
Current liabilities (85) (76) Ìý
Non-current liabilities (508) (413) Ìý
Total amount recognized (405) (297) Ìý
Amounts recognized in accumulated other comprehensive loss (income): Ìý Ìý Ìý
Net actuarial gain (1,720) (2,033) Ìý
Prior service cost (credit) (109) (131) Ìý
Net amount recognized $ (1,829) $ (2,164) Ìý