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(Summary Of Long-Term Debt) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Debt Instrument [Line Items]      
Long-term Debt, Gross $ 5,497 $ 7,992  
Capitalized leases 66 71  
Premiums, discounts, and debt issuance costs (48) (80)  
Terminated interest rate swaps 58 80  
Other (c) [1] 6 5  
Total (d) [2] 5,579 8,068  
Long-term Debt, Current Maturities 196 26  
Long-term debt 5,383 8,042  
6.875% notes – due 2023      
Debt Instrument [Line Items]      
Long-term Debt, Gross $ 94 $ 94  
Debt instrument, interest rate, stated percentage 6.875% 6.875%  
7.350% notes – due 2025      
Debt Instrument [Line Items]      
Long-term Debt, Gross $ 44 $ 44  
Debt instrument, interest rate, stated percentage 7.35% 7.35%  
7.750% notes – due 2025      
Debt Instrument [Line Items]      
Long-term Debt, Gross $ 31 $ 31  
Debt instrument, interest rate, stated percentage 7.75% 7.75%  
3.800% notes – due 2026      
Debt Instrument [Line Items]      
Long-term Debt, Gross $ 0 $ 517  
Debt instrument, interest rate, stated percentage 3.80% 3.80%  
7.200% notes – due 2026      
Debt Instrument [Line Items]      
Long-term Debt, Gross $ 58 $ 58  
Debt instrument, interest rate, stated percentage 7.20% 7.20%  
6.400% notes – due 2026      
Debt Instrument [Line Items]      
Long-term Debt, Gross $ 5 $ 5  
Debt instrument, interest rate, stated percentage 6.40% 6.40%  
3.000% notes – due 2027      
Debt Instrument [Line Items]      
Long-term Debt, Gross $ 0 $ 477  
Debt instrument, interest rate, stated percentage 3.00% 3.00%  
7.150% notes – due 2027      
Debt Instrument [Line Items]      
Long-term Debt, Gross $ 7 $ 7  
Debt instrument, interest rate, stated percentage 7.15% 7.15%  
3.550% notes – due 2029      
Debt Instrument [Line Items]      
Long-term Debt, Gross $ 0 $ 200  
Debt instrument, interest rate, stated percentage 3.55% 3.55%  
6.875% notes – due 2029      
Debt Instrument [Line Items]      
Long-term Debt, Gross $ 37 $ 37  
Debt instrument, interest rate, stated percentage 6.875% 6.875%  
5.000% notes – due 2035      
Debt Instrument [Line Items]      
Long-term Debt, Gross $ 407 $ 600  
Debt instrument, interest rate, stated percentage 5.00% 5.00%  
6.650% notes – due 2037      
Debt Instrument [Line Items]      
Long-term Debt, Gross $ 4 $ 4  
Debt instrument, interest rate, stated percentage 6.65% 6.65%  
8.700% notes – due 2038      
Debt Instrument [Line Items]      
Long-term Debt, Gross $ 265 $ 265  
Debt instrument, interest rate, stated percentage 8.70% 8.70%  
7.300% notes – due 2039      
Debt Instrument [Line Items]      
Long-term Debt, Gross $ 722 $ 722  
Debt instrument, interest rate, stated percentage 7.30% 7.30%  
6.000% notes – due 2041      
Debt Instrument [Line Items]      
Long-term Debt, Gross $ 585 $ 585  
Debt instrument, interest rate, stated percentage 6.00% 6.00%  
4.800% notes – due 2044      
Debt Instrument [Line Items]      
Long-term Debt, Gross $ 686 $ 800  
Debt instrument, interest rate, stated percentage 4.80% 4.80%  
5.150% notes – due 2046      
Debt Instrument [Line Items]      
Long-term Debt, Gross $ 449 $ 700  
Debt instrument, interest rate, stated percentage 5.15% 5.15%  
4.400% notes – due 2047      
Debt Instrument [Line Items]      
Long-term Debt, Gross $ 648 $ 1,084  
Debt instrument, interest rate, stated percentage 4.40% 4.40%  
4.350% notes – due 2048      
Debt Instrument [Line Items]      
Long-term Debt, Gross $ 744 $ 938  
Debt instrument, interest rate, stated percentage 4.35% 4.35%  
Floating rate notes – due 2020 – 2024 (a)      
Debt Instrument [Line Items]      
Long-term Debt, Gross [3] $ 222 $ 245  
Environmental and industrial development bonds – due 2022 – 2035 (b)      
Debt Instrument [Line Items]      
Long-term Debt, Gross [4] $ 489 $ 579  
Minimum [Member]      
Debt Instrument [Line Items]      
Debt instrument, interest rate, stated percentage 3.00% 3.00% 3.00%
Minimum [Member] | 3.550% notes – due 2029      
Debt Instrument [Line Items]      
Debt instrument, interest rate, stated percentage 3.55%    
Maximum [Member]      
Debt Instrument [Line Items]      
Debt instrument, interest rate, stated percentage 9.50% 9.50% 9.50%
[1] Includes $1 million and $4 million of fair market value adjustments as of December 31, 2021 and 2020, respectively.
[2] The fair market value was approximately $7.1 billion at December 31, 2021 and $10.5 billion at December 31, 2020.
[3] The weighted average interest rate on these notes was 1.4% in 2021 and 1.3% in 2020.
[4] The weighted average interest rate on these bonds was 3.2% in 2021 and 3.5% in 2020.