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Debt (Details) - USD ($)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Debt Disclosure [Abstract]      
Gain (Loss) on Extinguishment of Debt $ (168,000,000) $ 0 $ 0
Long-term debt 9,132,000,000 10,316,000,000  
Debt Instrument [Line Items]      
Long-term Debt and Lease Obligation, Including Current Maturities 9,827,000,000 10,327,000,000  
Short-term borrowings and current maturities of long-term debt 695,000,000 11,000,000  
Debt Instrument, Unamortized Discount $ (82,000,000) (90,000,000)  
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 695,000,000 11,000,000  
Long-term Debt, Maturities, Repayments of Principal in Year Two 9,000,000    
Long-term Debt, Maturities, Repayments of Principal in Year Three 602,000,000    
Long-term Debt, Maturities, Repayments of Principal in Year Four 0    
Long-term Debt, Maturities Repayments of Principal in Year Five 1,000,000,000.0    
Long-term debt 9,132,000,000 10,316,000,000  
Gain (Loss) on Extinguishment of Debt (168,000,000) 0 $ 0
Senior notes due November 2045      
Debt Disclosure [Abstract]      
Long-term debt $ 2,000,000,000 $ 2,000,000,000  
Debt Instrument [Line Items]      
Interest rate (in hundredths) 5.00% 5.00%  
Maturity date November 2045 November 2045  
Long-term debt $ 2,000,000,000 $ 2,000,000,000  
Senior Notes due November 2025      
Debt Disclosure [Abstract]      
Long-term debt $ 1,000,000,000 $ 2,000,000,000  
Debt Instrument [Line Items]      
Interest rate (in hundredths) 3.80% 3.80%  
Maturity date November 2025 November 2025  
Long-term debt $ 1,000,000,000 $ 2,000,000,000  
Senior notes due August 2023      
Debt Disclosure [Abstract]      
Long-term debt $ 600,000,000 $ 1,100,000,000  
Debt Instrument [Line Items]      
Interest rate (in hundredths) 3.50% 3.50%  
Maturity date August 2023 August 2023  
Long-term debt $ 600,000,000 $ 1,100,000,000  
Senior Notes due November 2035      
Debt Disclosure [Abstract]      
Long-term debt $ 1,000,000,000 $ 1,000,000,000  
Debt Instrument [Line Items]      
Interest rate (in hundredths) 4.85% 4.85%  
Maturity date November 2035 November 2035  
Long-term debt $ 1,000,000,000 $ 1,000,000,000  
Senior notes due September 2039      
Debt Disclosure [Abstract]      
Long-term debt $ 1,000,000,000 $ 1,000,000,000  
Debt Instrument [Line Items]      
Interest rate (in hundredths) 7.45% 7.45%  
Maturity date September 2039 September 2039  
Long-term debt $ 1,000,000,000 $ 1,000,000,000  
Senior notes due August 2043      
Debt Disclosure [Abstract]      
Long-term debt $ 900,000,000 $ 900,000,000  
Debt Instrument [Line Items]      
Interest rate (in hundredths) 4.75% 4.75%  
Maturity date August 2043 August 2043  
Long-term debt $ 900,000,000 $ 900,000,000  
Senior notes due September 2038      
Debt Disclosure [Abstract]      
Long-term debt $ 800,000,000 $ 800,000,000  
Debt Instrument [Line Items]      
Interest rate (in hundredths) 6.70% 6.70%  
Maturity date September 2038 September 2038  
Long-term debt $ 800,000,000 $ 800,000,000  
Senior notes due November 2021      
Debt Disclosure [Abstract]      
Long-term debt $ 500,000,000 $ 500,000,000  
Debt Instrument [Line Items]      
Interest rate (in hundredths) 3.25% 3.25%  
Maturity date November 2021 November 2021  
Long-term debt $ 500,000,000 $ 500,000,000  
Senior notes due November 2041      
Debt Disclosure [Abstract]      
Long-term debt $ 500,000,000 $ 500,000,000  
Debt Instrument [Line Items]      
Interest rate (in hundredths) 4.50% 4.50%  
Maturity date November 2041 November 2041  
Long-term debt $ 500,000,000 $ 500,000,000  
Senior debentures due August 2096      
Debt Disclosure [Abstract]      
Long-term debt $ 300,000,000 $ 300,000,000  
Debt Instrument [Line Items]      
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  
Long-term debt $ 300,000,000 $ 300,000,000  
Senior debentures due February 2021      
Debt Disclosure [Abstract]      
Long-term debt $ 185,000,000 $ 185,000,000  
Debt Instrument [Line Items]      
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  
Long-term debt $ 185,000,000 $ 185,000,000  
Senior notes due February 2027      
Debt Disclosure [Abstract]      
Long-term debt $ 104,000,000 $ 104,000,000  
Debt Instrument [Line Items]      
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  
Long-term debt $ 104,000,000 $ 104,000,000  
Other Debt Obligations      
Debt Disclosure [Abstract]      
Long-term debt 20,000,000 28,000,000  
Debt Instrument [Line Items]      
Long-term debt 20,000,000 28,000,000  
Senior notes due March 2030      
Debt Disclosure [Abstract]      
Long-term debt $ 1,000,000,000 0  
Debt Instrument [Line Items]      
Interest rate (in hundredths) 2.92%    
Long-term debt $ 1,000,000,000 $ 0  
Tender Offer on Senior notes due August 2023 and November 2025 [Member]      
Debt Disclosure [Abstract]      
Long-term debt 1,500,000,000    
Debt Instrument [Line Items]      
Long-term debt 1,500,000,000    
Tender Offer on Senior note due August 2023 [Member]      
Debt Disclosure [Abstract]      
Long-term debt 500,000,000    
Debt Instrument [Line Items]      
Long-term debt 500,000,000    
Tender Offer on Senior note due November 2025 [Member]      
Debt Disclosure [Abstract]      
Long-term debt 1,000,000,000.0    
Debt Instrument [Line Items]      
Long-term debt $ 1,000,000,000.0