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Fair Value Measurements - Narrative (Details) - USD ($)
1 Months Ended 3 Months Ended 6 Months Ended
Apr. 30, 2022
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Revolving Credit Facility | Variable-Rate Revolving Credit Facilities Due March 2023 | Line of Credit | Lending Joint Ventures            
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]            
Line of credit facility, borrowing capacity increase $ 75,000,000          
Carrying value            
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]            
Total debt   $ 20,800,000,000   $ 20,800,000,000   $ 20,400,000,000
Level 2 | Fair value            
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]            
Total debt   19,700,000,000   19,700,000,000   21,800,000,000
Financial Guarantee            
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]            
Carrying value of non-contingent liability   520,000,000   520,000,000    
Financial Guarantee | Lending Joint Ventures            
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]            
Carrying value of non-contingent liability   45,000,000   45,000,000   $ 10,000,000
Other (expense) income   3,000,000 $ 3,000,000 6,000,000 $ 6,000,000  
Financial Guarantee | Lending Joint Ventures | Variable-Rate Revolving Credit Facilities Due March 2023            
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]            
Other (expense) income   $ 62,000,000   $ 62,000,000