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Debt (Narrative) (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Mar. 31, 2021
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Debt Instrument [Line Items]            
Short-term debt $ 0     $ 0   $ 0
Carrying value 27,680,000,000     27,680,000,000   28,044,000,000
Long-term debt repaid       0 $ 6,542,000,000  
Loss on early extinguishment of debt 0 $ 0 $ 649,000,000 0 $ 649,000,000  
Loss on extinguishment of debt, premiums and fees     623,000,000      
Write-off of amortized debt discounts and issuance costs, debt extinguishment     26,000,000      
Accrued interest on long-term debt 376,000,000     $ 376,000,000   $ 429,000,000
Senior Notes [Member]            
Debt Instrument [Line Items]            
Debt instrument, repurchased face amount     4,042,000,000      
Senior Notes [Member] | USD Denominated Notes [Member]            
Debt Instrument [Line Items]            
Face amount     $ 5,500,000,000      
Senior Notes [Member] | USD Denominated Notes, 3.490 Percent, Due 2022 [Member]            
Debt Instrument [Line Items]            
Debt instrument, interest rate, stated percentage     3.49%      
Long-term debt repaid     $ 1,000,000,000      
Revolving Credit Facility [Member]            
Debt Instrument [Line Items]            
Debt instrument, covenant, consolidated EBITDA to interest expense ratio, minimum       4.0    
Debt instrument, consolidated EBITDA to interest expense ratio       10.7    
Revolving Credit Facility [Member] | Line of Credit [Member] | Revolving Credit Facility Due August 2024 [Member]            
Debt Instrument [Line Items]            
Debt instrument, term       5 years    
Face amount $ 3,000,000,000     $ 3,000,000,000    
Debt instrument, extension term       1 year    
London Interbank Offered Rate (LIBOR) [Member] | Revolving Credit Facility [Member] | Line of Credit [Member] | Revolving Credit Facility Due August 2024 [Member]            
Debt Instrument [Line Items]            
Debt instrument, basis spread on variable rate       1.00%