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Debt (Details) - USD ($)
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Apr. 27, 2022
Mar. 31, 2019
Debt Disclosure [Abstract]          
Gain (Loss) on Extinguishment of Debt $ (42,000,000) $ 0 $ (168,000,000)    
Long-term debt 7,928,000,000 9,127,000,000      
Debt Instrument [Line Items]          
Long-term Debt and Lease Obligation, Including Current Maturities 7,928,000,000 9,138,000,000      
Short-term borrowings and current maturities of long-term debt 0 11,000,000      
Debt Instrument, Unamortized Discount $ (76,000,000) (77,000,000)      
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 $ 3,500,000,000
Line of Credit Facility, Remaining Borrowing Capacity $ 3,500,000,000        
Long-term Debt, Maturities, Repayments of Principal in Year Two 0        
Long-term Debt, Maturities, Repayments of Principal in Year Three 400,000,000        
Long-term Debt, Maturities, Repayments of Principal in Year Four 0        
Long-term Debt, Maturities Repayments of Principal in Year Five 104,000,000        
Long-term debt 7,928,000,000 9,127,000,000      
Gain (Loss) on Extinguishment of Debt (42,000,000) 0 $ (168,000,000)    
Long-Term Debt, Maturity, Year One 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 $ 400,000,000 $ 1,000,000,000      
Debt Instrument [Line Items]          
Interest rate (in hundredths) 3.80% 3.80%      
Maturity date November 2025 November 2025      
Long-term debt $ 400,000,000 $ 1,000,000,000      
Early Repayment of Senior Debt 600,000,000        
Repayments of Senior Debt 641,000,000        
Senior notes due August 2023          
Debt Disclosure [Abstract]          
Long-term debt $ 0 $ 600,000,000      
Debt Instrument [Line Items]          
Interest rate (in hundredths) 3.50% 3.50%      
Maturity date August 2023 August 2023      
Long-term debt $ 0 $ 600,000,000      
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 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 $ 294,000,000 $ 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 $ 294,000,000 $ 300,000,000      
Senior debentures due February 2021          
Debt Instrument [Line Items]          
Debt instruments non-call feature description may not be redeemed prior to maturity        
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 6,000,000 11,000,000      
Debt Instrument [Line Items]          
Long-term debt 6,000,000 11,000,000      
Senior notes due March 2030          
Debt Disclosure [Abstract]          
Long-term debt 1,000,000,000 1,000,000,000      
Debt Instrument [Line Items]          
Long-term debt $ 1,000,000,000 $ 1,000,000,000      
Outstanding balance of Senior Notes due August 2023          
Debt Instrument [Line Items]          
Interest rate (in hundredths) 3.50%        
Senior Notes due August 2023          
Debt Instrument [Line Items]          
Early Repayment of Senior Debt $ 600,000,000        
Repayments of Senior Debt 603,000,000        
Outstanding balance of Senior Notes due November 2025          
Debt Disclosure [Abstract]          
Long-term debt 400,000,000        
Debt Instrument [Line Items]          
Long-term debt $ 400,000,000        
Senior Notes due February 2027          
Debt Instrument [Line Items]          
Interest rate (in hundredths) 6.75%        
Senior Debentures due August 2096          
Debt Instrument [Line Items]          
Interest rate (in hundredths) 7.60%