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(Summary Of Long-Term Debt) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Debt Instrument [Line Items]      
Long-term Debt, Gross $ 7,992 $ 9,699  
Capitalized leases 95 100  
Premiums, discounts, and debt issuance costs (80) (88)  
Terminated interest rate swaps 80 0  
Interest rate swaps 0 46  
Other (c) [1] 6 8  
Total (d) [2] 8,093 9,765  
Long-term Debt, Current Maturities 29 168  
Long-term debt 8,064 9,597  
7.500% notes – due 2021      
Debt Instrument [Line Items]      
Long-term Debt, Gross $ 0 $ 406  
Debt instrument, interest rate, stated percentage 7.50% 7.50%  
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%  
3.650% notes – due 2024      
Debt Instrument [Line Items]      
Long-term Debt, Gross $ 0 $ 658  
Debt instrument, interest rate, stated percentage 3.65% 3.65%  
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 $ 517 $ 645  
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 $ 477 $ 803  
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 $ 200 $ 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 $ 600 $ 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 $ 800 $ 800  
Debt instrument, interest rate, stated percentage 4.80% 4.80%  
5.150% notes – due 2046      
Debt Instrument [Line Items]      
Long-term Debt, Gross $ 700 $ 700  
Debt instrument, interest rate, stated percentage 5.15% 5.15%  
4.400% notes – due 2047      
Debt Instrument [Line Items]      
Long-term Debt, Gross $ 1,084 $ 1,158  
Debt instrument, interest rate, stated percentage 4.40% 4.40%  
4.350% notes – due 2048      
Debt Instrument [Line Items]      
Long-term Debt, Gross $ 938 $ 986  
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] $ 245 $ 339  
Environmental and industrial development bonds – due 2022 – 2035 (b)      
Debt Instrument [Line Items]      
Long-term Debt, Gross [4] $ 579 $ 552  
Minimum [Member]      
Debt Instrument [Line Items]      
Debt instrument, interest rate, stated percentage 3.00% 3.00% 3.00%
Maximum [Member]      
Debt Instrument [Line Items]      
Debt instrument, interest rate, stated percentage 9.50% 9.50% 9.50%
[1] Includes $4 million and $7 million of fair market value adjustments as of December 31, 2020 and 2019, respectively.
[2] The fair market value was approximately $10.5 billion at December 31, 2020 and $10.9 billion at December 31, 2019.
[3] The weighted average interest rate on these notes was 1.3% in 2020 and 3.1% in 2019.
[4] The weighted average interest rate on these bonds was 3.5% in 2020 and 4.4% in 2019.