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Debt (Narrative) (Details) - USD ($)
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Debt Instrument [Line Items]      
Short-term debt $ 0   $ 0
Carrying value 27,922,000,000   28,044,000,000
Long-term debt repaid 0 $ 5,042,000,000  
Loss on early extinguishment of debt 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 $ 236,000,000   $ 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    
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%