v3.25.4
Segment, Major Customer and Major Supplier Information - Selected Segment Financial Information (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2025
Dec. 31, 2024
Mar. 31, 2025
Segment Reporting Information [Line Items]          
Net sales $ 4,186 $ 4,080 $ 13,647 $ 12,562  
Cost of goods sold (exclusive of depreciation and amortization) 3,513 3,516 11,617 10,607  
Selling, general and administrative expenses 177 179 525 543  
Adjusted EBITDA 348 367 1,186 1,329  
Depreciation and amortization 155 142 455 423  
Income tax provision 4 39 115 150  
Capital expenditures 664 458 1,577 1,175  
Equity Method Investments 981   981   $ 912
Assets 18,246   18,246   16,515
Net sales – third party          
Segment Reporting Information [Line Items]          
Net sales 4,075 3,978 13,302 12,243  
Net sales – intersegment          
Segment Reporting Information [Line Items]          
Net sales 360 138 804 467  
Operating Segments          
Segment Reporting Information [Line Items]          
Net sales 4,435 4,116 14,106 12,710  
Depreciation and amortization 159 143 471 432  
Income tax provision (46) 32 13 116  
Capital expenditures 673 465 1,600 1,202  
Equity Method Investments 981   981   912
Assets 16,745   16,745   15,259
Operating Segments | North America          
Segment Reporting Information [Line Items]          
Net sales 1,690 1,647 5,833 5,159  
Cost of goods sold (exclusive of depreciation and amortization) 1,518 1,437 5,234 4,393  
Selling, general and administrative expenses 65 74 212 232  
Segment Reporting, Other Segment Item, Amount 13 14 26 44  
Adjusted EBITDA 94 122 361 490  
Depreciation and amortization 66 56 194 170  
Income tax provision (87) (5) (84) 3  
Capital expenditures 588 366 1,371 983  
Equity Method Investments 0   0   0
Assets 8,137   8,137   6,638
Operating Segments | North America | Net sales – third party          
Segment Reporting Information [Line Items]          
Net sales 1,690 1,647 5,833 5,156  
Operating Segments | North America | Net sales – intersegment          
Segment Reporting Information [Line Items]          
Net sales 0 0 0 3  
Operating Segments | Europe          
Segment Reporting Information [Line Items]          
Net sales 1,280 1,054 3,780 3,346  
Cost of goods sold (exclusive of depreciation and amortization) 1,146 953 3,399 2,953  
Selling, general and administrative expenses 48 49 146 152  
Segment Reporting, Other Segment Item, Amount 8 3 6 39  
Adjusted EBITDA 78 49 229 202  
Depreciation and amortization 45 42 134 126  
Income tax provision 14 5 15 (3)  
Capital expenditures 39 54 112 112  
Equity Method Investments 588   588   542
Assets 4,410   4,410   4,303
Operating Segments | Europe | Net sales – third party          
Segment Reporting Information [Line Items]          
Net sales 1,159 1,041 3,655 3,315  
Operating Segments | Europe | Net sales – intersegment          
Segment Reporting Information [Line Items]          
Net sales 121 13 125 31  
Operating Segments | Asia          
Segment Reporting Information [Line Items]          
Net sales 737 730 2,455 2,235  
Cost of goods sold (exclusive of depreciation and amortization) 646 616 2,111 1,870  
Selling, general and administrative expenses 26 28 81 85  
Segment Reporting, Other Segment Item, Amount 17 11 23 22  
Adjusted EBITDA 48 75 240 258  
Depreciation and amortization 25 23 76 70  
Income tax provision 4 12 22 40  
Capital expenditures 20 27 48 64  
Equity Method Investments 393   393   370
Assets 2,022   2,022   2,163
Operating Segments | Asia | Net sales – third party          
Segment Reporting Information [Line Items]          
Net sales 556 608 1,923 1,855  
Operating Segments | Asia | Net sales – intersegment          
Segment Reporting Information [Line Items]          
Net sales 181 122 532 380  
Operating Segments | South America          
Segment Reporting Information [Line Items]          
Net sales 728 685 2,038 1,970  
Cost of goods sold (exclusive of depreciation and amortization) 569 534 1,609 1,506  
Selling, general and administrative expenses 27 27 65 78  
Segment Reporting, Other Segment Item, Amount 2 3 7 11  
Adjusted EBITDA 130 121 357 375  
Depreciation and amortization 23 22 67 66  
Income tax provision 23 20 60 76  
Capital expenditures 26 18 69 43  
Equity Method Investments 0   0   0
Assets 2,176   2,176   2,155
Operating Segments | South America | Net sales – third party          
Segment Reporting Information [Line Items]          
Net sales 670 682 1,891 1,917  
Operating Segments | South America | Net sales – intersegment          
Segment Reporting Information [Line Items]          
Net sales 58 3 147 53  
Eliminations and Other          
Segment Reporting Information [Line Items]          
Adjusted EBITDA (2) 0 (1) 4  
Depreciation and amortization (4) (1) (16) (9)  
Income tax provision 50 7 102 34  
Capital expenditures (9) (7) (23) (27)  
Equity Method Investments 0   0   0
Assets 1,501   1,501   $ 1,256
Eliminations and Other | Net sales – third party          
Segment Reporting Information [Line Items]          
Net sales 111 102 345 319  
Eliminations and Other | Net sales – intersegment          
Segment Reporting Information [Line Items]          
Net sales $ (360) $ (138) $ (804) $ (467)