Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies - Liabilities Measured at Fair Value (Details)

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Summary of Significant Accounting Policies - Liabilities Measured at Fair Value (Details) - USD ($)
$ in Millions
Sep. 30, 2021
Dec. 31, 2020
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Debt $ 9,132 $ 9,011
Level 1    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Debt 0 0
Level 2    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Debt 9,132 9,011
Level 3    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Debt $ 0 $ 0