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Debt (Details) - USD ($)
3 Months Ended 12 Months Ended
Feb. 23, 2022
Sep. 30, 2021
Mar. 31, 2021
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Debt Disclosure [Abstract]            
Gain (Loss) on Extinguishment of Debt       $ 0 $ (168,000,000) $ 0
Long-term debt       9,127,000,000 9,132,000,000  
Debt Instrument [Line Items]            
Long-term Debt and Lease Obligation, Including Current Maturities       9,138,000,000 9,827,000,000  
Short-term borrowings and current maturities of long-term debt       11,000,000 695,000,000  
Debt Instrument, Unamortized Discount       $ (77,000,000) (82,000,000)  
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       7,000,000 695,000,000  
Long-term Debt, Maturities, Repayments of Principal in Year Two       600,000,000    
Long-term Debt, Maturities, Repayments of Principal in Year Three       0    
Long-term Debt, Maturities, Repayments of Principal in Year Four       1,000,000,000    
Long-term Debt, Maturities Repayments of Principal in Year Five       0    
Long-term debt       9,127,000,000 9,132,000,000  
Gain (Loss) on Extinguishment of Debt       0 (168,000,000) $ 0
Long-Term Debt, Maturity, Year One       7,000,000    
Subsequent Event [Member]            
Debt Instrument [Line Items]            
Subsequent Event, Date Feb. 23, 2022          
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 $ 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       $ 1,000,000,000 $ 1,000,000,000  
Senior Notes due November 2025 | Subsequent Event [Member]            
Debt Instrument [Line Items]            
Early Repayment of Senior Debt $ 600,000,000          
Senior notes due August 2023            
Debt Disclosure [Abstract]            
Long-term debt       $ 600,000,000 $ 600,000,000  
Debt Instrument [Line Items]            
Interest rate (in hundredths)       3.50% 3.50%  
Maturity date       August 2023 August 2023  
Long-term debt       $ 600,000,000 $ 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 2021            
Debt Disclosure [Abstract]            
Long-term debt       $ 0 $ 500,000,000  
Debt Instrument [Line Items]            
Interest rate (in hundredths)       3.25% 3.25%  
Maturity date       November 2021 November 2021  
Long-term debt       $ 0 $ 500,000,000  
Repayments of Senior Debt   $ 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       $ 0 $ 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       $ 0 $ 185,000,000  
Repayments of Senior Debt     $ 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       11,000,000 20,000,000  
Debt Instrument [Line Items]            
Long-term debt       11,000,000 20,000,000  
Senior notes due March 2030            
Debt Disclosure [Abstract]            
Long-term debt       $ 1,000,000,000 1,000,000,000  
Debt Instrument [Line Items]            
Interest rate (in hundredths)       2.92%    
Long-term debt       $ 1,000,000,000 $ 1,000,000,000  
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    
Debt Instrument [Line Items]            
Long-term debt       $ 1,000,000,000    
Senior notes due August 2021            
Debt Instrument [Line Items]            
Interest rate (in hundredths)       3.25%