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Debt And Lines Of Credit (Tables)
 12 Months Ended
Dec. 31, 2023
Debt Instruments [Abstract]  
Debt Extinguishment [Table Text Block]
Amounts related to early debt extinguishment during the years ended December 31, 2023, 2022 and 2021 were as follows: 

In millions202320222021
Early debt reductions (a)$— $503 $2,472 
Pre-tax early debt extinguishment costs (b)— 93 461 
(a)Reductions related to notes with interest rates ranging from 3.00% to 8.70% with original maturities from 2021 to 2048 for the years ended December 31, 2022 and 2021.
(b)Amounts are included in Restructuring and other charges in the accompanying consolidated statements of operations.
Summary Of Long-Term Debt [Table Text Block]
A summary of long-term debt follows: 
In millions at December 3120232022
6.875% notes – due 2023
$— $87 
7.350% notes – due 2025
39 39 
7.750% notes – due 2025
22 22 
7.200% notes – due 2026
58 58 
6.400% notes – due 2026
5 5 
7.150% notes – due 2027
7 7 
6.875% notes – due 2029
10 10 
5.000% notes – due 2035
407 407 
6.650% notes – due 2037
3 3 
8.700% notes – due 2038
86 86 
7.300% notes – due 2039
453 453 
6.000% notes – due 2041
585 585 
4.800% notes – due 2044
686 686 
5.150% notes – due 2046
449 449 
4.400% notes – due 2047
647 647 
4.350% notes – due 2048
740 740 
Floating rate notes – due 2023 – 2027 (a)
308 732 
Environmental and industrial development bonds – due 2023 – 2028 (b)
419 489 
Floating rate term loan - due 2028
600 — 
Total principal5,524 5,505 
Capitalized leases55 59 
Premiums, discounts, and debt issuance costs(41)(42)
Terminated interest rate swaps54 55 
Other 1 2 
Total (c)5,593 5,579 
Less: current maturities138 763 
Long-term debt$5,455 $4,816 
(a)The weighted average interest rate on these notes was 5.4% in 2023 and 4.6% in 2022.
(b)The weighted average interest rate on these bonds was 2.4% in 2023 and 2.4% in 2022.
(c)The fair market value was approximately $5.5 billion at December 31, 2023 and $5.2 billion at December 31, 2022. Debt fair value measurements use Level 2 inputs.