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Fair Value Measurements - Narrative (Details) - USD ($)
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Carrying value      
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]      
Total debt $ 20,400,000,000   $ 19,900,000,000
Fair Value, Inputs, Level 2 | Fair value      
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]      
Total debt 21,900,000,000   22,500,000,000
Fair Value, Inputs, Level 3      
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]      
Contingent liability 7,000,000   8,000,000
Line of Credit | Revolving credit facility      
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]      
Maximum borrowing capacity 3,500,000,000    
Lending Joint Ventures      
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]      
Other (expense) income 3,000,000 $ 2,000,000  
Variable-Rate Term Loan Facilities Due March 2023 | Line of Credit | Term loan facility      
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]      
Maximum borrowing capacity 380,000,000    
Variable-Rate Revolving Credit Facilities Due March 2023 | Line of Credit | Revolving credit facility      
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]      
Maximum borrowing capacity 45,000,000    
Outstanding borrowings 13,000,000    
Financial Guarantee | Lending Joint Ventures      
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]      
Carrying value of non-contingent liability $ 16,000,000   $ 18,000,000