| In millions, except per share items | Jun-30-23 | Dec-31-22 | Sep-30-22 | Jun-30-22 | Mar-31-22 | Dec-31-21 | Sep-30-21 | Jun-30-21 |
| | 10-Q | 10-K | 8-K | 10-Q | 10-Q | 10-K | 10-Q | 10-Q |
| Operating Activities: | | | | | | | | |
| Net earnings | 606.0 | 1,009.0 | 538.0 | 1,339.0 | 1,051.0 | 859.0 | -91.0 | 317.0 |
| Adjustments to reconcile net earnings to net cash from operating activities: | | | | | | | | |
| Depreciation and amortization | | 198.0 | 221.0 | 223.0 | 208.0 | 238.0 | | 243.0 |
| Deferred income taxes | | -100.0 | -7.0 | 2.0 | -2.0 | -171.0 | | -19.0 |
| Stock-based compensation expense | | 9.0 | 10.0 | 12.0 | 10.0 | 7.0 | | 8.0 |
| Loss on debt extinguishment | | | | 8.0 | | | 13.0 | |
| Unrealized net gain on natural gas derivatives | | | | -50.0 | | | | |
| Gain on sale of emission credits | | -6.0 | | -3.0 | | -49.0 | | |
| Gain (Loss) on Disposition of Property Plant Equipment | | | | | | | | 1.0 |
| Undistributed earnings of affiliate—net of taxes | | | | -3.0 | | | | |
| Changes in: | | | | | | | | |
| Accounts receivable—net | | -110.0 | | -54.0 | -185.0 | -120.0 | | -130.0 |
| Inventories | | 38.0 | -32.0 | -33.0 | -66.0 | -3.0 | | 79.0 |
| Accrued and prepaid income taxes | | -227.0 | | -375.0 | 387.0 | 226.0 | | -78.0 |
| Accounts payable and accrued expenses | | -110.0 | -112.0 | 147.0 | 76.0 | 73.0 | | 49.0 |
| Customer advances | | -471.0 | | -526.0 | -102.0 | 325.0 | | -332.0 |
| Other—net | | -252.0 | | 15.0 | 49.0 | -2.0 | | -20.0 |
| Net cash provided by operating activities | 606.0 | 585.0 | 990.0 | 889.0 | 1,391.0 | 1,480.0 | 417.0 | 128.0 |
| |
| Investing Activities: | | | | | | | | |
| Additions to property, plant and equipment | | -453.0 | | -66.0 | -63.0 | -132.0 | | -110.0 |
| Proceeds from sale of property, plant and equipment | | | | | 1.0 | | | |
| Distributions received from unconsolidated affiliate | | | | 4.0 | | | | |
| Purchase of emission credits | | -9.0 | | -9.0 | | -10.0 | | |
| Proceeds from sale of emission credits | | | | 12.0 | | | | |
| Net cash used in investing activities | | -132.0 | -187.0 | -59.0 | -62.0 | -83.0 | | -111.0 |
| |
| Financing Activities: | | | | | | | | |
| Repayments of Long-term Debt | | -507.0 | | -507.0 | | | | |
| Payments of Financing Costs | | | | | -4.0 | | | |
| Dividends paid | | -306.0 | | -83.0 | -64.0 | -65.0 | | -65.0 |
| Distributions to noncontrolling interest | | -619.0 | | | -247.0 | | | |
| Purchases of treasury stock | | -251.0 | -519.0 | -479.0 | -98.0 | -489.0 | | |
| Proceeds from issuances of common stock under employee stock plans | | | | 4.0 | 97.0 | 32.0 | | 19.0 |
| Net cash provided by (used in) financing activities | | -330.0 | -966.0 | -1,065.0 | -339.0 | -527.0 | | -46.0 |
| Effect of exchange rate changes on cash and cash equivalents | | -20.0 | | -12.0 | -1.0 | | | 2.0 |
| Increase in cash and cash equivalents | | | | -247.0 | 989.0 | | | -27.0 |
| Cash and cash equivalents at beginning of period | | | 2,370.0 | | | | | |
| Cash and cash equivalents at end of period | | | 2,192.0 | | | | | |