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Debt (Details) - USD ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Debt Instrument [Line Items]    
Long-term Debt and Lease Obligation, Including Current Maturities $ 10,327,000,000 $ 10,344,000,000
Short-term borrowings and current maturities of long-term debt 11,000,000 32,000,000
Long-term debt 10,316,000,000 10,312,000,000
Debt Instrument, Unamortized Discount $ (90,000,000) (92,000,000)
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.  
Long-term Line of Credit $ 3,500,000,000  
Line of Credit Facility, Remaining Borrowing Capacity 3,500,000,000  
Long-term Debt, Current Maturities 11,000,000  
Long-term Debt, Maturities, Repayments of Principal in Year Two 697,000,000  
Long-term Debt, Maturities, Repayments of Principal in Year Three 4,000,000  
Long-term Debt, Maturities, Repayments of Principal in Year Four 1,100,000,000  
Long-term Debt, Maturities Repayments of Principal in Year Five 0  
Senior notes due November 2045    
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    
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    
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 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 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%
Debt instruments non-call feature description may not be redeemed prior to maturity  
Maturity date February 2021 February 2021
Senior notes due February 2027    
Debt Instrument [Line Items]    
Long-term debt $ 104,000,000 $ 104,000,000
Interest rate (in hundredths) 6.75% 6.75%
Debt instruments non-call feature description may not be redeemed prior to maturity  
Maturity date February 2027 February 2027
Other Debt Obligations    
Debt Instrument [Line Items]    
Long-term debt $ 28,000,000 $ 47,000,000