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Debt (Narrative) (Details) - USD ($)
1 Months Ended 3 Months Ended 9 Months Ended
Aug. 31, 2022
Sep. 30, 2022
Sep. 30, 2021
Mar. 31, 2021
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2021
Debt Instrument [Line Items]              
Short-term debt   $ 0     $ 0   $ 0
Carrying value   26,291,000,000     26,291,000,000   28,044,000,000
Long-term debt repaid         1,105,000,000 $ 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   196,000,000     $ 196,000,000   $ 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      
Debt instrument, interest rate, stated percentage 2.85%            
Repayments of senior unsecured debt $ 1,100,000,000            
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         10.9    
Revolving Credit Facility [Member] | Line of Credit [Member] | Revolving Credit Facility Due August 2024 [Member]              
Debt Instrument [Line Items]              
Face amount   $ 3,000,000,000     $ 3,000,000,000    
Debt instrument, term         5 years    
Term Secured Overnight Financing Rate ("Term SOFR") | 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%