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Debt - Long-term Notes Payable (Details) - USD ($)
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
May 18, 2020
Sep. 26, 2019
Debt Instrument [Line Items]          
Outstanding aggregate principal amount $ 9,000,000,000        
Senior Notes | Notes          
Debt Instrument [Line Items]          
Outstanding aggregate principal amount 9,000,000,000   $ 9,000,000,000    
Interest expense, including amortization of debt issuance costs $ 56,000,000 $ 33,000,000      
Senior Notes | Fixed-rate Notes Issued May 2020          
Debt Instrument [Line Items]          
Face amount       $ 4,000,000,000.0  
Senior Notes | Fixed-rate Notes Issued September 2019          
Debt Instrument [Line Items]          
Face amount         $ 5,000,000,000.0