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Segment Disclosures - Segment Data For Gross Margin (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Segment reporting information      
Net sales $ 7,084 $ 5,936 $ 6,631
Cost of sales:      
Natural gas, including the impact of realized derivatives 1,163 829 1,251
Unrealized net mark-to-market loss (gain) on natural gas derivatives (5) 35 39
Depreciation and amortization 896 921 859
Distribution and storage 295 258 274
Freight 327 312 330
Other segment items 1,674 1,595 1,411
Cost of sales 4,360 3,880 4,086
Gross margin 2,724 2,056 2,545
Total other operating costs and expenses 438 314 307
Equity in earnings (loss) of operating affiliate 14 4 (8)
Operating earnings 2,300 1,746 2,230
Depreciation and amortization 898 925 869
Impairment of equity method investment in PLNL 0 0 43
Corporate      
Cost of sales:      
Depreciation and amortization 32 34 13
Supply Contracts | Waggaman Ammonia Production Facility      
Cost of sales:      
Depreciation and amortization 30 30 3
Point Lisas Nitrogen Limited (PLNL)      
Cost of sales:      
Impairment of equity method investment in PLNL     43
Ammonia      
Segment reporting information      
Net sales 2,176 1,736 1,679
Cost of sales:      
Natural gas, including the impact of realized derivatives 431 283 407
Unrealized net mark-to-market loss (gain) on natural gas derivatives 2 (13) (11)
Depreciation and amortization 280 269 174
Distribution and storage 221 187 192
Freight 52 50 42
Other segment items 508 467 334
Cost of sales 1,494 1,243 1,138
Gross margin 682 493 541
Granular Urea      
Segment reporting information      
Net sales 1,781 1,600 1,823
Cost of sales:      
Natural gas, including the impact of realized derivatives 301 241 363
Unrealized net mark-to-market loss (gain) on natural gas derivatives 1 (9) (11)
Depreciation and amortization 253 284 285
Distribution and storage 10 9 10
Freight 33 32 43
Other segment items 346 369 320
Cost of sales 944 926 1,010
Gross margin 837 674 813
UAN      
Segment reporting information      
Net sales 2,161 1,678 2,068
Cost of sales:      
Natural gas, including the impact of realized derivatives 339 234 367
Unrealized net mark-to-market loss (gain) on natural gas derivatives 2 (10) (11)
Depreciation and amortization 265 268 288
Distribution and storage 61 60 67
Freight 148 142 156
Other segment items 425 375 384
Cost of sales 1,240 1,069 1,251
Gross margin 921 609 817
AN      
Segment reporting information      
Net sales 421 419 497
Cost of sales:      
Natural gas, including the impact of realized derivatives 39 34 51
Unrealized net mark-to-market loss (gain) on natural gas derivatives 0 1 2
Depreciation and amortization 33 39 48
Distribution and storage 0 1 2
Freight 30 29 24
Other segment items 240 238 236
Cost of sales 342 340 359
Gross margin 79 79 138
Other      
Segment reporting information      
Net sales 545 503 564
Cost of sales:      
Natural gas, including the impact of realized derivatives 53 37 63
Unrealized net mark-to-market loss (gain) on natural gas derivatives 0 2 4
Depreciation and amortization 65 61 64
Distribution and storage 3 1 3
Freight 64 59 65
Other segment items 155 146 137
Cost of sales 340 302 328
Gross margin $ 205 $ 201 $ 236