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Fair Value Measurements - Narrative (Details) - USD ($)
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Carrying value      
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]      
Total debt $ 21,300,000,000   $ 21,500,000,000
Fair Value, Inputs, Level 2 | Fair value      
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]      
Total debt 22,000,000,000.0   22,600,000,000
Fair Value, Recurring | Fair Value, Inputs, Level 3      
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]      
Contingent consideration 38,000,000   1,000,000
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 2,000,000 $ 1,000,000  
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 400,000,000    
Outstanding borrowings 25,000,000    
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    
Financial Guarantee | Lending Joint Ventures      
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]      
Carrying value of non-contingent liability 24,000,000   $ 26,000,000
Cumulative Effect, Period of Adoption, Adjustment | Fair Value, Inputs, Level 3      
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]      
Contingent liability $ 13,000,000