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Debt (Details) - USD ($)
3 Months Ended 12 Months Ended
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2017
Dec. 31, 2016
Jul. 21, 2015
Debt Instrument [Line Items]          
Long-term Debt and Capital Lease Obligations, Including Current Maturities     $ 10,942,000,000 $ 12,384,000,000  
Long-term debt     10,430,000,000 12,214,000,000  
Debt Instrument, Unamortized Discount     $ (98,000,000) (110,000,000)  
Debt instrument call feature description     We may redeem all of our senior notes from time to time or all of the notes of each series at any time at the applicable redemption prices, plus accrued and unpaid interest.    
Early Repayment of Senior Debt   $ 1,400,000,000      
Gain (Loss) on Extinguishment of Debt     $ 104,000,000    
Line of credit facility, maximum borrowing capacity         $ 3,000,000,000
Long-term Debt, Current Maturities     440,000,000    
Line of Credit Facility, Remaining Borrowing Capacity     3,000,000,000 3,000,000,000  
Short-term borrowings and current maturities of long-term debt     512,000,000 170,000,000  
Long-term Debt, Maturities, Repayments of Principal in Year Two     30,000,000    
Long-term Debt, Maturities, Repayments of Principal in Year Three     26,000,000    
Long-term Debt, Maturities, Repayments of Principal in Year Four     709,000,000    
Long-term Debt, Maturities Repayments of Principal in Year Five     14,000,000    
Senior notes due November 2045 [Member]          
Debt Instrument [Line Items]          
Long-term debt     $ 2,000,000,000 $ 2,000,000,000  
Interest rate (in hundredths)     5.00% 5.00%  
Maturity date     November 2045 November 2045  
Senior Notes due November 2025 [Member]          
Debt Instrument [Line Items]          
Long-term debt     $ 2,000,000,000 $ 2,000,000,000  
Interest rate (in hundredths)     3.80% 3.80%  
Maturity date     November 2025 November 2025  
Senior notes due August 2023          
Debt Instrument [Line Items]          
Long-term debt     $ 1,100,000,000 $ 1,100,000,000  
Interest rate (in hundredths)     3.50% 3.50%  
Maturity date     August 2023 August 2023  
Senior Notes due November 2035 [Member]          
Debt Instrument [Line Items]          
Long-term debt     $ 1,000,000,000 $ 1,000,000,000  
Interest rate (in hundredths)     4.85% 4.85%  
Maturity date     November 2035 November 2035  
Senior notes due September 2019          
Debt Instrument [Line Items]          
Long-term debt   1,000,000,000 $ 0 $ 1,000,000,000  
Interest rate (in hundredths)     6.15% 6.15%  
Maturity date     September 2019 September 2019  
Senior notes due September 2039          
Debt Instrument [Line Items]          
Long-term debt     $ 1,000,000,000 $ 1,000,000,000  
Interest rate (in hundredths)     7.45% 7.45%  
Maturity date     September 2039 September 2039  
Senior notes due August 2043          
Debt Instrument [Line Items]          
Long-term debt     $ 900,000,000 $ 900,000,000  
Interest rate (in hundredths)     4.75% 4.75%  
Maturity date     August 2043 August 2043  
Senior notes due September 2038          
Debt Instrument [Line Items]          
Long-term debt     $ 800,000,000 $ 800,000,000  
Interest rate (in hundredths)     6.70% 6.70%  
Maturity date     September 2038 September 2038  
Senior notes due November 2021          
Debt Instrument [Line Items]          
Long-term debt     $ 500,000,000 $ 500,000,000  
Interest rate (in hundredths)     3.25% 3.25%  
Maturity date     November 2021 November 2021  
Senior notes due November 2041          
Debt Instrument [Line Items]          
Long-term debt     $ 500,000,000 $ 500,000,000  
Interest rate (in hundredths)     4.50% 4.50%  
Maturity date     November 2041 November 2041  
Senior notes due August 2018          
Debt Instrument [Line Items]          
Long-term debt     $ 400,000,000 $ 400,000,000  
Interest rate (in hundredths)     2.00% 2.00%  
Maturity date     August 2018 August 2018  
Senior notes due September 2018          
Debt Instrument [Line Items]          
Long-term debt   $ 400,000,000 $ 0 $ 400,000,000  
Interest rate (in hundredths)     5.90% 5.90%  
Maturity date     September 2018 September 2018  
Senior debentures due August 2096          
Debt Instrument [Line Items]          
Long-term debt     $ 300,000,000 $ 300,000,000  
Interest rate (in hundredths)     7.60% 7.60%  
Debt instruments non-call feature description     may not be redeemed prior to maturity    
Maturity date     August 2096 August 2096  
Senior debentures due February 2021          
Debt Instrument [Line Items]          
Long-term debt     $ 185,000,000 $ 185,000,000  
Interest rate (in hundredths)     8.75% 8.75%  
Maturity date     February 2021 February 2021  
Senior notes due February 2027 [Member] [Domain]          
Debt Instrument [Line Items]          
Long-term debt     $ 104,000,000 $ 104,000,000  
Interest rate (in hundredths)     6.75% 6.75%  
Maturity date     February 2027 February 2027  
Senior notes due May 2017          
Debt Instrument [Line Items]          
Long-term debt     $ 0 $ 45,000,000  
Interest rate (in hundredths)     7.53% 7.53%  
Repayments of Senior Debt $ 45,000,000        
Maturity date     May 2017 May 2017  
Other Debt Obligations [Member]          
Debt Instrument [Line Items]          
Long-term debt     $ 251,000,000 $ 260,000,000