| Sep 30, 2018 | Sep 30, 2019 | Sep 30, 2020 | Sep 30, 2021 | Sep 30, 2022 | Sep 30, 2023 |
|---|
| Consolidated net (loss) income | 1,909 | 868 | -686 | 843 | 949 | -1,644 |
|---|
| Depreciation, depletion and amortization | 1,252 | 1,511 | 1,487 | 1,460 | 1,489 | 1,536 |
|---|
| Deferred income tax benefit | -1,069 | 37 | 43 | -38 | -98 | -475 |
|---|
| Share-based compensation expense | 67 | 64 | 130 | 89 | 93 | 64 |
|---|
| 401(k) match and company contribution in common stock | - | - | - | 136 | 3 | - |
|---|
| Pension and other postretirement funding (more) less than cost (income) | 97 | 61 | 80 | 112 | 136 | -16 |
|---|
| Cash surrender value increase in excess of premiums paid | - | - | - | 49 | 2 | 38 |
|---|
| Equity in income of unconsolidated entities | 34 | 10 | 16 | 41 | 73 | 3 |
|---|
| Gain on sale of RTS and Chattanoonga | - | - | - | - | - | 239 |
|---|
| Gain on sale of other businesses | - | - | - | - | - | 11 |
|---|
| Impairment of goodwill and mineral rights | - | - | - | - | - | 1,893 |
|---|
| Other impairment adjustments | - | - | - | - | - | -637 |
|---|
| (Gain) loss on disposal of plant, equipment and other, net | - | 43 | 13 | -4 | 18 | 3 |
|---|
| Other | -85 | -80 | -39 | -29 | -2 | -34 |
|---|
| Accounts receivable | 143 | -273 | -30 | 429 | 162 | -407 |
|---|
| Inventories | 72 | 111 | -22 | 200 | 310 | -108 |
|---|
| Other assets | 23 | 125 | 202 | 380 | -79 | 264 |
|---|
| Accounts payable | 180 | -39 | -86 | 430 | 80 | -280 |
|---|
| Income taxes | 131 | 7 | -28 | 1 | 17 | 91 |
|---|
| Accrued liabilities and other | 21 | -54 | 98 | 553 | -240 | 68 |
|---|
| Net cash provided by operating activities | 2,421 | 2,310 | 2,071 | 2,280 | 2,020 | 1,828 |
|---|
| Capital expenditures | 1,000 | 1,369 | 978 | 816 | 863 | 1,142 |
|---|
| Cash paid for purchase of businesses, net of cash acquired | 240 | 3,374 | - | - | 7 | 854 |
|---|
| Proceeds from Life Insurance Policy | - | - | - | 45 | 61 | 42 |
|---|
| Proceeds from sale of RTS and Chattanooga, net | - | - | - | - | - | 318 |
|---|
| Proceeds from sale of other businesses | - | - | - | - | - | 28 |
|---|
| Proceeds from currency forward contracts | - | - | - | - | - | 23 |
|---|
| Proceeds from the sale of unconsolidated entities | - | - | - | - | - | 53 |
|---|
| Proceeds from sale of investment | - | - | - | 30 | - | - |
|---|
| Proceeds from sale of property, plant and equipment | 23 | 119 | 35 | 6 | 28 | 27 |
|---|
| Proceeds from Insurance Settlement, Investing Activities | - | 26 | 7 | 3 | 2 | - |
|---|
| Other | -32 | -30 | -16 | 3 | -3 | 3 |
|---|
| Net cash used for investing activities | -1,299 | -4,580 | -921 | -676 | -776 | -1,507 |
|---|
| Proceeds from issuance of notes | 1,197 | 2,498 | 599 | - | - | - |
|---|
| Proceeds from Lines of Credit | - | - | 428 | 435 | 377 | 53 |
|---|
| Repayments of revolving credit facilities | - | - | 528 | 415 | 373 | 344 |
|---|
| Additions to debt | 855 | 5,062 | 696 | 260 | 503 | 1,836 |
|---|
| Repayments of debt | 2,033 | 5,632 | 1,449 | 1,544 | 992 | 1,721 |
|---|
| Changes in commercial paper, net | - | 339 | -339 | - | - | 284 |
|---|
| Other debt (repayments) additions, net | - | - | -80 | 23 | 32 | -7 |
|---|
| Purchases of common stock | 195 | 89 | - | 122 | 600 | - |
|---|
| Cash dividends paid to stockholders | 441 | 468 | 345 | 234 | 260 | 281 |
|---|
| Other | 8 | 8 | -22 | -1 | 26 | -13 |
|---|
| Net cash used for financing activities | -755 | 1,780 | -1,021 | -1,580 | -1,281 | -193 |
|---|
| Effect of exchange rate changes on cash, cash equivalents and restricted cash | - | 4 | -29 | 16 | 6 | 6 |
|---|
| Increase (Decrease) in cash, cash equivalents and restricted cash | - | -485 | 100 | 40 | -31 | 133 |
|---|