Equity Method Investments (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Equity method investments
Liability (refund) adjustment from settlement with taxing authority		$ 39
Impairment of equity method investment in PLNL	$ 0	0	$ 43
Point Lisas Nitrogen Limited (PLNL)
Equity method investments
Equity Method Investments	$ 32
Obligation to purchase ammonia (description)	50% of the ammonia produced by PLNL
Unrecorded Unconditional Purchase Obligation, Purchases	$ 120	$ 90	142
Point Lisas Nitrogen Limited (PLNL)
Equity method investments
Ownership interest (as a percent)	50.00%
Impairment of equity method investment in PLNL			$ 43

Amount of other-than-temporary decline in value that has been recognized against investment accounted for under equity method of accounting.

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

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This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.

+ References

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The amount of the additional liability or refund received or expected based on a final settlement with a taxing authority.

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No definition available.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Describes the nature of an unconditional purchase obligation that is not recognized as a liability on the balance sheet.

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The amount purchased during the period under an unrecorded unconditional purchase obligation (for example, under the take-or-pay or throughput contract).

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