Expected rate of compensation increases (for pay-related plans) to determine net periodic cost and benefit obligation.

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- Definition

Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Retail Price Index

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An assumption as to the rate of return on plan assets reflecting the average rate of earnings expected on the funds invested or to be invested to provide for the benefits included in the benefit obligation and determine net periodic cost.

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Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Retail Price Index

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- Definition

Defined Benefit Plan, Assumptions Used in Calculation, Weighted-Average Interest Crediting Rate

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- Definition

Defined Benefit Plan, Post-65 Health Care Cost Trend Rate Assumed for Next Fiscal Year, Used in Calculating Benefit Obligation

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Defined Benefit Plan, Post-65 Ultimate Health Care Cost Trend Rate

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Defined Benefit Plan, Pre-65 Health Care Cost Trend Rate Assumed for Next Fiscal Year

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Defined Benefit Plan, Pre-65 Ultimate Health Care Cost Trend Rate

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- Definition

Represents the target allocation percentage of investments in non-equity securities to total plan assets presented on a weighted-average basis as of the measurement date of the latest statement of financial position. Non-equity securities consist of debt, money market instruments and actively managed portfolios.

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- Definition

Defined Benefit Plan, Target Plan Asset Allocations, Growth Portfolio

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Defined Benefit Plan, Target Plan Asset Allocations, Matching Portfolio

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- Definition

Weighted average rate for present value of future retirement benefits cash flows, used to determine benefit obligation of defined benefit plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (k)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-1

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- Definition

Weighted-average interest crediting rate used to determine benefit obligation of defined benefit plan. Plan includes, but is not limited to, cash balance and other defined benefit plans with promised interest crediting rate.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (k)(4)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-1

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Weighted average rate for present value of future retirement benefits cash flows, used to determine net periodic benefit cost of defined benefit plan.

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Weighted-average interest crediting rate used to determine net periodic benefit cost of defined benefit plan. Plan includes, but is not limited to, cash balance and other defined benefit plans with promised interest crediting rate.

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Amount of benefit for defined benefit plan expected to be paid in five fiscal years after fifth fiscal year following current fiscal year.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (f)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-1

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Amount of benefit for defined benefit plan expected to be paid in next fiscal year following current fiscal year.

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Amount of benefit for defined benefit plan expected to be paid in fifth fiscal year following current fiscal year.

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Amount of benefit for defined benefit plan expected to be paid in fourth fiscal year following current fiscal year.

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Amount of benefit for defined benefit plan expected to be paid in third fiscal year following current fiscal year.

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Amount of benefit for defined benefit plan expected to be paid in second fiscal year following current fiscal year.

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Percentage of target investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 17
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480482/715-20-55-17

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Pension and Other Postretirement Benefits (Details 3) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Retiree Medical
Assumptions used in determining the benefit obligations and expense:
Defined benefit plan, pre-65 health care cost trend rate assumed for next fiscal year		8.40%	8.00%
Defined benefit plan, pre-65 ultimate health care cost trend rate for 2026		4.50%	4.50%
Defined benefit plan, post-65 health care cost trend rate assumed for next fiscal year		9.80%	8.40%
Defined benefit plan, post-65 ultimate health care cost trend rate for 2026		4.50%	4.50%
United States \| Pension Plans
Current target asset allocation
Defined Benefit Plan Target Allocation Percentage of Assets Non Equity Securities		80.00%
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage		20.00%
North America
Assumptions used in determining the benefit obligations and expense:
Weighted-average cash balance interest crediting rate—obligation		4.40%	3.90%	3.90%
Weighted-average cash balance interest crediting rate—expense		3.90%	3.90%	3.00%
Cash balance interest crediting rate for the plan		3.00%
North America \| Pension Plans
Expected future pension and retiree medical benefit payments:
2025		$ 14
2026		15
2027		16
2028		16
2029		17
2030-2034		$ 92
Assumptions used in determining the benefit obligations and expense:
Weighted average discount rate - obligation (as a percent)		5.20%	4.80%	5.10%
Weighted average discount rate - expense (as a percent)		4.80%	5.10%	3.60%
Weighted average rate of increase in future compensation (as a percent)		3.30%	3.30%	3.80%
Weighted average expected long-term rate of return on assets-expense (as a percent)		5.00%	4.80%	3.90%
North America \| Pension Plans \| Forecast
Assumptions used in determining the benefit obligations and expense:
Weighted average expected long-term rate of return on assets-expense (as a percent)	5.10%
North America \| Retiree Medical
Expected future pension and retiree medical benefit payments:
2025		$ 2
2026		2
2027		2
2028		2
2029		2
2030-2034		$ 7
Assumptions used in determining the benefit obligations and expense:
Weighted average discount rate - obligation (as a percent)		5.40%	4.80%	5.00%
Weighted average discount rate - expense (as a percent)		4.80%	5.00%	2.70%
Canada \| Pension Plans \| Terra Canadian Plan
Current target asset allocation
Defined Benefit Plan Target Allocation Percentage of Assets Non Equity Securities		100.00%
United Kingdom \| Forecast
Assumptions used in determining the benefit obligations and expense:
Weighted average expected long-term rate of return on assets-expense (as a percent)	6.10%
United Kingdom \| United Kingdom Terra
Current target asset allocation
Defined Benefit Plan, Target Plan Asset Allocations, Growth Portfolio		25.00%	46.00%
Defined Benefit Plan, Target Plan Asset Allocations, Matching Portfolio		75.00%	54.00%
United Kingdom \| United Kingdom Kemira
Current target asset allocation
Defined Benefit Plan, Target Plan Asset Allocations, Growth Portfolio		30.00%	57.00%
Defined Benefit Plan, Target Plan Asset Allocations, Matching Portfolio		70.00%	43.00%
United Kingdom \| Pension Plans
Expected future pension and retiree medical benefit payments:
2025		$ 25
2026		25
2027		26
2028		27
2029		27
2030-2034		$ 148
Assumptions used in determining the benefit obligations and expense:
Weighted average discount rate - obligation (as a percent)		5.50%	4.60%	4.80%
Weighted average discount rate - expense (as a percent)		4.60%	4.80%	2.00%
Weighted average expected long-term rate of return on assets-expense (as a percent)		6.50%	6.10%	3.40%
Weighted-average retail price index—obligation (as a percent)		3.10%	3.00%	3.20%
Weighted-average retail price index—expense (as a percent)		3.00%	3.20%	3.30%