Debt And Lines Of Credit (Tables)

12 Months Ended

Dec. 31, 2020

Debt Instruments [Abstract]

Debt Extinguishment [Table Text Block]

Amounts related to early debt extinguishment during the years ended December 31, 2020, 2019 and 2018 were as follows: 

In millions	2020		2019		2018
Early debt reductions (a)	$	1,640	$	614	$	780
Pre-tax early debt extinguishment costs (b)	196		21		10

(a)Reductions related to notes with interest rates ranging from 3.00% to 9.50% with original maturities from 2021 to 2048 for the years ended December 31, 2020, 2019 and 2018.

(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 31	2020		2019
7.500% notes – due 2021	$	—	$	406
6.875% notes – due 2023	94		94
3.650% notes – due 2024	—		658
7.350% notes – due 2025	44		44
7.750% notes – due 2025	31		31
3.800% notes – due 2026	517		645
7.200% notes – due 2026	58		58
6.400% notes – due 2026	5		5
3.000% notes – due 2027	477		803
7.150% notes – due 2027	7		7
3.550% notes – due 2029	200		200
6.875% notes – due 2029	37		37
5.000% notes – due 2035	600		600
6.650% notes – due 2037	4		4
8.700% notes – due 2038	265		265
7.300% notes – due 2039	722		722
6.000% notes – due 2041	585		585
4.800% notes – due 2044	800		800
5.150% notes – due 2046	700		700
4.400% notes – due 2047	1,084		1,158
4.350% notes – due 2048	938		986
Floating rate notes – due 2020 – 2024 (a)	245		339
Environmental and industrial development bonds – due 2022 – 2035 (b)	579		552
Total principal	7,992		9,699
Capitalized leases	95		100
Premiums, discounts, and debt issuance costs	(80)		(88)
Terminated interest rate swaps	80		—
Interest rate swaps	—		46
Other (c)	6		8
Total (d)	8,093		9,765
Less: current maturities	29		168
Long-term debt	$	8,064	$	9,597

(a)The weighted average interest rate on these notes was 1.3% in 2020 and 3.1% in 2019.

(b)The weighted average interest rate on these bonds was 3.5% in 2020 and 4.4% in 2019.

(c)Includes $4 million and $7 million of fair market value adjustments as of December 31, 2020 and 2019, respectively.

(d)The fair market value was approximately $10.5 billion at December 31, 2020 and $10.9 billion at December 31, 2019.