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Debt (Senior Notes) (Narrative) (Details) - USD ($)
9 Months Ended
Feb. 11, 2021
Sep. 30, 2021
Jan. 29, 2021
Dec. 31, 2020
Debt Instrument [Line Items]        
Debt instrument, principal amount   $ 11,937,000,000   $ 11,180,000,000
Aggregate redemption price, percentage   35.00%    
2021 Senior Notes [Member]        
Debt Instrument [Line Items]        
Debt instrument, principal amount   $ 1,500,000,000 $ 1,500,000,000  
Debt instrument, maturity date   Feb. 01, 2029    
Debt instrument, interest rate, stated percentage   3.125%    
Interest payable dates   February 1 and August 1    
Financing fees   $ 14,500,000    
Redemption period   Feb. 01, 2024    
Redemption price, percentage   103.125%    
2021 Senior Notes [Member] | Redemption, Period One [Member]        
Debt Instrument [Line Items]        
Redemption period   Feb. 01, 2024    
Redemption price, percentage   101.563%    
2021 Senior Notes [Member] | Redemption, Period Two [Member]        
Debt Instrument [Line Items]        
Redemption period   Feb. 01, 2025    
Redemption price, percentage   100.781%    
2021 Senior Notes [Member] | Redemption, Period Three [Member]        
Debt Instrument [Line Items]        
Redemption period   Feb. 01, 2026    
Redemption price, percentage   100.00%    
2017 Senior Notes [Member]        
Debt Instrument [Line Items]        
Debt instrument, principal amount       $ 750,000,000
Debt instrument, maturity date   Oct. 01, 2022    
Debt instrument, interest rate, stated percentage   4.00%    
Repayments of unsecured debt $ 750,000,000.0      
Debt call premium 7,500,000      
Write-off of deferred financing fees $ 4,200,000