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Borrowings and Other Obligations Fair and carrying value of long-term debt (Details) - USD ($)
$ in Millions
Sep. 30, 2021
Dec. 31, 2020
Senior Notes    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term Debt $ 1,898 $ 2,098
Secured Debt    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term Debt 488 0
Unsecured Debt    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term Debt 2,098  
Fair Value, Inputs, Level 2 | Senior Notes | Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term Debt, Fair Value 2,215 1,628
Fair Value, Inputs, Level 2 | Secured Debt | Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term Debt, Fair Value $ 516 $ 507