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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Operating Activities:    
Net earnings $ 650 $ 1,051
Adjustments to reconcile net earnings to net cash provided by operating activities:    
Depreciation and amortization 206 208
Deferred income taxes (26) (2)
Stock-based compensation expense 12 10
Unrealized net gain on natural gas derivatives (72) (33)
Gain on sale of emission credits (35) 0
Undistributed earnings of affiliate—net of taxes (7) (2)
Changes in:    
Accounts receivable—net 101 (185)
Inventories 39 (66)
Accrued and prepaid income taxes 153 387
Accounts payable and accrued expenses (135) 76
Customer advances 55 (102)
Other—net 6 49
Net cash provided by operating activities 947 1,391
Investing Activities:    
Additions to property, plant and equipment (69) (63)
Proceeds from sale of property, plant and equipment 0 1
Purchase of emission credits 0 (9)
Proceeds from sale of emission credits 35 9
Net cash used in investing activities (34) (62)
Financing Activities:    
Payments of Financing Costs 0 (4)
Dividends paid (79) (64)
Distributions to noncontrolling interest (255) (247)
Purchases of treasury stock (54) (98)
Proceeds from issuances of common stock under employee stock plans 0 97
Shares withheld for taxes (22) (23)
Net cash provided by (used in) financing activities (410) (339)
Effect of exchange rate changes on cash and cash equivalents (1) (1)
Increase in cash and cash equivalents 502 989
Cash and cash equivalents at beginning of period 2,323 1,628
Cash and cash equivalents at end of period $ 2,825 $ 2,617