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Debt And Lines Of Credit (Summary Of Long-Term Debt) (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2015
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2007
Debt Instrument [Line Items]          
Debt         $ 2,100
Total (d) [1]   $ 11,157 $ 11,314    
Less: current maturities   (311) (239)    
Long-term debt   $ 10,846 $ 11,075    
Debt Instrument, Maturity Date Range, Start Apr. 01, 2015 Apr. 01, 2015 Apr. 01, 2015  
Debt Instrument, Maturity Date Range, End Dec. 01, 2030 Dec. 01, 2030 Dec. 01, 2030  
9 3/8% note – due 2019          
Debt Instrument [Line Items]          
Maturity date   May 15, 2019 May 15, 2019    
Interest rate   9.375% 9.375%    
Debt   $ 0 $ 295    
8.7% note – due 2038          
Debt Instrument [Line Items]          
Maturity date   Jun. 15, 2038 Jun. 15, 2038    
Interest rate   8.70% 8.70%    
Debt   $ 264 $ 264    
7.95% debenture – due 2018          
Debt Instrument [Line Items]          
Maturity date   Jun. 15, 2018 Jun. 15, 2018    
Interest rate   7.95% 7.95%    
Debt   $ 0 $ 382    
7.5% note – due 2021          
Debt Instrument [Line Items]          
Maturity date   Aug. 15, 2021 Aug. 15, 2021    
Interest rate   7.50% 7.50%    
Debt   $ 409 $ 598    
7.3% note – due 2039          
Debt Instrument [Line Items]          
Maturity date   Nov. 15, 2039 Nov. 15, 2039    
Interest rate   7.30% 7.30%    
Debt   $ 721 $ 721    
6 7/8% notes – due 2023 – 2029          
Debt Instrument [Line Items]          
Interest rate   6.875% 6.875%    
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    
6.65% note – due 2037          
Debt Instrument [Line Items]          
Interest rate   6.65% 6.65%    
Debt   $ 4 $ 4    
Debt Instrument, Maturity Date Range, End   Dec. 15, 2037 Dec. 15, 2037    
6 5/8% note – due 2018          
Debt Instrument [Line Items]          
Maturity date   Jan. 01, 2018 Jan. 01, 2018    
Interest rate   6.625% 6.625%    
Debt   $ 0 $ 72    
6.4% to 7.75% debentures due 2025 – 2027          
Debt Instrument [Line Items]          
Debt   $ 143 $ 142    
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    
Interest rate   6.00% 6.00%    
Debt   $ 585 $ 585    
5.00% to 5.15% notes – due 2035 – 2046          
Debt Instrument [Line Items]          
Debt   $ 1,281 $ 1,280    
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]          
Interest rate   4.80% 4.80%    
Debt   $ 796 $ 796    
Debt Instrument, Maturity Date Range, End   Jun. 15, 2044 Jun. 15, 2044    
4.75% note – due 2022          
Debt Instrument [Line Items]          
Interest rate   4.75% 4.75%    
Debt   $ 817 $ 810    
Debt Instrument, Maturity Date Range, End   Feb. 15, 2022 Feb. 15, 2022    
3.00% to 4.40% notes – due 2024 – 2048          
Debt Instrument [Line Items]          
Debt   $ 4,775 $ 3,786    
Debt Instrument, Maturity Date Range, Start   Jun. 15, 2024 Jun. 15, 2024    
Debt Instrument, Maturity Date Range, End   Aug. 15, 2048 Aug. 15, 2047    
Variable Rate Debt [Member]          
Debt Instrument [Line Items]          
Debt [2]   $ 650 $ 763    
Debt Instrument, Interest Rate During Period   2.60% 2.20%    
Debt Instrument, Maturity Date Range, Start   Jan. 05, 2017 Dec. 31, 2016    
Debt Instrument, Maturity Date Range, End   Mar. 01, 2025 Mar. 01, 2025    
Environmental and industrial development bonds – due 2017 – 2035 (b)          
Debt Instrument [Line Items]          
Debt [3]   $ 585 $ 681    
Debt Instrument, Interest Rate During Period   6.00% 5.90%    
Debt Instrument, Maturity Date Range, Start   Feb. 01, 2017 Jul. 01, 2016    
Debt Instrument, Maturity Date Range, End   Dec. 01, 2035 Dec. 01, 2035    
Other (c)          
Debt Instrument [Line Items]          
Debt [4]   $ (4) $ 4    
Minimum [Member]          
Debt Instrument [Line Items]          
Interest rate   1.57% 1.57% 1.57%  
Minimum [Member] | 6.4% to 7.75% debentures due 2025 – 2027          
Debt Instrument [Line Items]          
Interest rate   6.40% 6.40%    
Minimum [Member] | 5.00% to 5.15% notes – due 2035 – 2046          
Debt Instrument [Line Items]          
Interest rate   5.00% 5.00%    
Minimum [Member] | 3.00% to 4.40% notes – due 2024 – 2048          
Debt Instrument [Line Items]          
Interest rate   3.00% 3.00%    
Maximum [Member]          
Debt Instrument [Line Items]          
Interest rate   9.38% 9.38% 9.38%  
Maximum [Member] | 6.4% to 7.75% debentures due 2025 – 2027          
Debt Instrument [Line Items]          
Interest rate   7.75% 7.75%    
Maximum [Member] | 5.00% to 5.15% notes – due 2035 – 2046          
Debt Instrument [Line Items]          
Interest rate   5.15% 5.15%    
Maximum [Member] | 3.00% to 4.40% notes – due 2024 – 2048          
Debt Instrument [Line Items]          
Interest rate   4.40% 4.40%    
[1] The fair market value was approximately $12.3 billion at December 31, 2017 and $12.0 billion at December 31, 2016.
[2] The weighted average interest rate on these notes was 2.6% in 2017 and 2.2% in 2016.
[3] The weighted average interest rate on these bonds was 6.0% in 2017 and 5.9% in 2016.
[4] Includes $70 million and $69 million of debt issuance costs as of December 31, 2017 and 2016, respectively.