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Debt And Lines Of Credit (Summary Of Long-Term Debt) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2007
Debt Instrument [Line Items]        
Debt       $ 2,100
Total (d) [1] $ 10,654 $ 11,157    
Less: current maturities (639) (311)    
Long-term debt $ 10,015 $ 10,846    
Debt Instrument, Maturity Date Range, Start Jun. 15, 2018 Jun. 15, 2018 Jun. 15, 2018  
Debt Instrument, Maturity Date Range, End Sep. 01, 2032 Sep. 01, 2032 Sep. 01, 2032  
8.7% note – due 2038        
Debt Instrument [Line Items]        
Maturity date Jun. 15, 2038 Jun. 15, 2038    
Debt $ 264 $ 264    
Debt Instrument, Interest Rate, Stated Percentage 8.70% 8.70%    
7.5% note – due 2021        
Debt Instrument [Line Items]        
Maturity date Aug. 15, 2021 Aug. 15, 2021    
Debt $ 406 $ 409    
Debt Instrument, Interest Rate, Stated Percentage 7.50% 7.50%    
7.3% note – due 2039        
Debt Instrument [Line Items]        
Maturity date Nov. 15, 2039 Nov. 15, 2039    
Debt $ 721 $ 721    
Debt Instrument, Interest Rate, Stated Percentage 7.30% 7.30%    
6 7/8% notes – due 2023 – 2029        
Debt Instrument [Line Items]        
Debt $ 131 $ 131    
Debt Instrument, Maturity Date Range, Start Nov. 01, 2023 Nov. 01, 2023    
Debt Instrument, Maturity Date Range, End Apr. 15, 2029 Apr. 15, 2029    
Debt Instrument, Interest Rate, Stated Percentage 6.875% 6.875%    
6.65% note – due 2037        
Debt Instrument [Line Items]        
Maturity date Dec. 15, 2037 Dec. 15, 2037    
Debt $ 4 $ 4    
Debt Instrument, Interest Rate, Stated Percentage 6.65% 6.65%    
6.4% to 7.75% debentures due 2025 – 2027        
Debt Instrument [Line Items]        
Debt $ 144 $ 143    
Debt Instrument, Maturity Date Range, Start Sep. 01, 2025 Sep. 01, 2025    
Debt Instrument, Maturity Date Range, End Dec. 15, 2027 Dec. 15, 2027    
6.0% note – due 2041        
Debt Instrument [Line Items]        
Maturity date Nov. 15, 2041 Nov. 15, 2041    
Debt $ 585 $ 585    
Debt Instrument, Interest Rate, Stated Percentage 6.00% 6.00%    
5.00% to 5.15% notes – due 2035 – 2046        
Debt Instrument [Line Items]        
Debt $ 1,288 $ 1,281    
Debt Instrument, Maturity Date Range, Start Sep. 15, 2035 Sep. 15, 2035    
Debt Instrument, Maturity Date Range, End May 15, 2046 May 15, 2046    
4.8% note – due 2044        
Debt Instrument [Line Items]        
Maturity date Jun. 15, 2044 Jun. 15, 2044    
Debt $ 799 $ 796    
Debt Instrument, Interest Rate, Stated Percentage 4.80% 4.80%    
4.75% note – due 2022        
Debt Instrument [Line Items]        
Maturity date Feb. 15, 2022 Feb. 15, 2022    
Debt $ 355 $ 817    
Debt Instrument, Interest Rate, Stated Percentage 4.75% 4.75%    
3.00% to 4.40% notes – due 2024 – 2048        
Debt Instrument [Line Items]        
Debt $ 4,481 $ 4,775    
Debt Instrument, Maturity Date Range, Start Jun. 15, 2024 Jun. 15, 2024    
Debt Instrument, Maturity Date Range, End Aug. 15, 2048 Aug. 15, 2048    
Floating rate notes – due 2018 – 2023 (a)        
Debt Instrument [Line Items]        
Debt [2] $ 908 $ 650    
Debt Instrument, Interest Rate During Period 3.50% 2.60%    
Debt Instrument, Maturity Date Range, Start May 01, 2018 May 01, 2018    
Debt Instrument, Maturity Date Range, End May 01, 2023 May 01, 2023    
Environmental and industrial development bonds – due 2018 – 2035 (b)        
Debt Instrument [Line Items]        
Debt [3] $ 566 $ 585    
Debt Instrument, Interest Rate During Period 5.50% 6.00%    
Debt Instrument, Maturity Date Range, Start Feb. 01, 2018 Feb. 01, 2018    
Debt Instrument, Maturity Date Range, End Dec. 01, 2035 Dec. 01, 2035    
Other (c)        
Debt Instrument [Line Items]        
Debt [4] $ 2 $ (4)    
Credit Facility [Domain]        
Debt Instrument [Line Items]        
Available Liquidity Facilities 0      
Receivables Securitization Program [Member]        
Debt Instrument [Line Items]        
Collateralized Agreements $ 0      
Minimum [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Interest Rate, Stated Percentage 1.57% 1.57% 1.57%  
Minimum [Member] | 6.4% to 7.75% debentures due 2025 – 2027        
Debt Instrument [Line Items]        
Debt Instrument, Interest Rate, Stated Percentage 6.40% 6.40%    
Minimum [Member] | 5.00% to 5.15% notes – due 2035 – 2046        
Debt Instrument [Line Items]        
Debt Instrument, Interest Rate, Stated Percentage 5.00% 5.00%    
Minimum [Member] | 3.00% to 4.40% notes – due 2024 – 2048        
Debt Instrument [Line Items]        
Debt Instrument, Interest Rate, Stated Percentage 3.00% 3.00%    
Maximum [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Interest Rate, Stated Percentage 9.38% 9.38% 9.38%  
Maximum [Member] | 6.4% to 7.75% debentures due 2025 – 2027        
Debt Instrument [Line Items]        
Debt Instrument, Interest Rate, Stated Percentage 7.75% 7.75%    
Maximum [Member] | 5.00% to 5.15% notes – due 2035 – 2046        
Debt Instrument [Line Items]        
Debt Instrument, Interest Rate, Stated Percentage 5.15% 5.15%    
Maximum [Member] | 3.00% to 4.40% notes – due 2024 – 2048        
Debt Instrument [Line Items]        
Debt Instrument, Interest Rate, Stated Percentage 4.40% 4.40%    
[1] The fair market value was approximately $10.6 billion at December 31, 2018 and $12.3 billion at December 31, 2017.
[2] The weighted average interest rate on these notes was 3.5% in 2018 and 2.6% in 2017.
[3] The weighted average interest rate on these bonds was 5.5% in 2018 and 6.0% in 2017.
[4] Includes $60 million and $70 million of debt issuance costs as of December 31, 2018 and 2017, respectively.