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Investments - Summary of Investments in Unconsolidated Variable Interest Entities and Estimated Maximum Exposure to Loss (Detail) - USD ($)
Dec. 31, 2021
Dec. 31, 2020
Variable Interest Entity    
Investments in Unconsolidated VIEs $ 24,689,000,000 $ 24,564,000,000
Variable Interest Entity, Not Primary Beneficiary    
Variable Interest Entity    
Investments in Unconsolidated VIEs 56,000,000  
Maximum Exposure to Loss 104,000,000  
Variable Interest Entity, Not Primary Beneficiary | NQ Fund III    
Variable Interest Entity    
Investments in Unconsolidated VIEs 7,000,000  
Maximum Exposure to Loss 12,000,000  
Variable Interest Entity, Not Primary Beneficiary | NQ Fund IV    
Variable Interest Entity    
Investments in Unconsolidated VIEs 12,000,000  
Maximum Exposure to Loss 14,000,000  
Variable Interest Entity, Not Primary Beneficiary | NQ Fund V    
Variable Interest Entity    
Investments in Unconsolidated VIEs 22,000,000  
Maximum Exposure to Loss 51,000,000  
Variable Interest Entity, Not Primary Beneficiary | NQ PE Fund I    
Variable Interest Entity    
Investments in Unconsolidated VIEs 7,000,000  
Maximum Exposure to Loss 8,000,000  
Variable Interest Entity, Not Primary Beneficiary | Longwood    
Variable Interest Entity    
Investments in Unconsolidated VIEs 3,000,000  
Maximum Exposure to Loss 10,000,000  
Variable Interest Entity, Not Primary Beneficiary | Other    
Variable Interest Entity    
Investments in Unconsolidated VIEs 5,000,000  
Maximum Exposure to Loss $ 9,000,000