v3.26.1
Revision of prior period financial statements - Condensed Consolidated Statements of Cash Flows (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2026
Mar. 31, 2026
Jun. 30, 2025
Mar. 31, 2025
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2025
Cash Flows from Operating Activities:              
Net income (loss) $ 476 $ (107) $ 416 $ (94) $ 369 $ 322 $ 1,191
Adjustments to reconcile net (loss) income to net cash used in operating activities:              
Depreciation, depletion, accretion and amortization $ 257 237 226 220 494 444  
Share-based compensation   9   1 20 3  
Deferred tax benefit (expense)   (20)   6 27 (2)  
Other items, net   26   35 72 54  
Changes in operating assets and liabilities, net of effects of acquisitions:              
Accounts receivable, net   (209)   (287) (939) (827)  
Due from related party   0   13 0 49  
Inventories, net   3   (109) (40) (108)  
Accounts payable   (510)   (213) (186) 18  
Due to related party   0   62 0 (96)  
Other assets   (165)   (72) (159) (115)  
Other liabilities   (150)   (403) (121) (170)  
Defined benefit pension plans and other postretirement benefit plans   (7)   (6) (12) (13)  
Net cash used in operating activities   (893)   (847) (475) (441)  
Cash Flows from Investing Activities:              
Purchases of property, plant and equipment   (275)   (213) (520) (448)  
Net cash used in investing activities   (662)   (62) (896) (11)  
Cash Flows from Financing Activities:              
Transfers to Holcim, net   0   (96) 0 (98)  
Net cash provided by (used in) financing activities   743   (104) $ 188 (566)  
As previously reported              
Cash Flows from Operating Activities:              
Net income (loss)   (118) 428 (87)   341 1,182
Adjustments to reconcile net (loss) income to net cash used in operating activities:              
Depreciation, depletion, accretion and amortization   236   218   439  
Share-based compensation   9   1   3  
Deferred tax benefit (expense)   (17)   0   (11)  
Other items, net   24   29   59  
Changes in operating assets and liabilities, net of effects of acquisitions:              
Accounts receivable, net   (223)   (310)   (849)  
Due from related party   0   13   49  
Inventories, net   16   (121)   (128)  
Accounts payable   (521)   (198)   27  
Due to related party   0   78   (80)  
Other assets   (159)   (44)   (91)  
Other liabilities   (136)   (429)   (196)  
Defined benefit pension plans and other postretirement benefit plans   (7)   (6)   (13)  
Net cash used in operating activities   (896)   (856)   (450)  
Cash Flows from Investing Activities:              
Purchases of property, plant and equipment   (272)   (211)   (446)  
Net cash used in investing activities   (659)   (60)   (9)  
Cash Flows from Financing Activities:              
Transfers to Holcim, net   0   (89)   (91)  
Net cash provided by (used in) financing activities   743   (97)   (559)  
Adjustments              
Cash Flows from Operating Activities:              
Net income (loss)   11 $ (12) (7)   (19) $ 9
Adjustments to reconcile net (loss) income to net cash used in operating activities:              
Depreciation, depletion, accretion and amortization   1   2   5  
Share-based compensation   0   0   0  
Deferred tax benefit (expense)   (3)   6   9  
Other items, net   2   6   (5)  
Changes in operating assets and liabilities, net of effects of acquisitions:              
Accounts receivable, net   14   23   22  
Due from related party   0   0   0  
Inventories, net   (13)   12   20  
Accounts payable   11   (15)   (9)  
Due to related party   0   (16)   (16)  
Other assets   (6)   (28)   (24)  
Other liabilities   (14)   26   26  
Defined benefit pension plans and other postretirement benefit plans   0   0   0  
Net cash used in operating activities   3   9   9  
Cash Flows from Investing Activities:              
Purchases of property, plant and equipment   (3)   (2)   (2)  
Net cash used in investing activities   (3)   (2)   (2)  
Cash Flows from Financing Activities:              
Transfers to Holcim, net   0   (7)   (7)  
Net cash provided by (used in) financing activities   $ 0   $ (7)   $ (7)