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Fair Value Disclosures (Analysis of Level 3 Assets and Liabilities Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
May 31, 2019
Jun. 30, 2018
May 31, 2019
Jun. 30, 2018
Nov. 30, 2018
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]          
Transfers of assets from Level 2 to Level 3 $ 31,700 $ 78,700 $ 42,300 $ 49,100  
Transfers of assets from Level 3 to Level 2 79,500 28,000 89,000 14,900  
Transfers of liabilities from Level 2 to Level 3 57,400   69,600    
Transfers of liabilities from Level 3 to Level 2 105,400   63,200    
Net gains (losses) on Level 3 assets (realized and unrealized) 23,200 (10,700) 23,300 16,700  
Net gains (losses) on Level 3 liabilities (realized and unrealized)   25,800   27,600  
Net gains (losses) on Level 3 liabilities (realized and unrealized), included in earnings and OCI 14,100   42,800    
Excluded assets from unobservable quantitative information 73,600   73,600   $ 40,300
Excluded liabilities from unobservable quantitative information 900   900   $ 500
Loans and other receivables          
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]          
Transfers of assets from Level 2 to Level 3 11,300 16,400 15,700    
Transfers of assets from Level 3 to Level 2 10,500 9,200      
Net gains (losses) on Level 3 assets (realized and unrealized) (2,753) (6,051) 2,434 (201)  
CDOs and CLOs          
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]          
Transfers of assets from Level 2 to Level 3   20,300   12,700  
Transfers of assets from Level 3 to Level 2 17,600 11,700 12,500    
Net gains (losses) on Level 3 assets (realized and unrealized) (1,663) (2,616) (1,233) (3,227)  
Commercial mortgage-backed securities          
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]          
Transfers of assets from Level 2 to Level 3   17,100   19,700  
Net gains (losses) on Level 3 assets (realized and unrealized) (357) (2,213) (180) (2,292)  
Net gains (losses) on Level 3 liabilities (realized and unrealized) (70) (35)   (105)  
Residential mortgage-backed securities          
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]          
Transfers of assets from Level 3 to Level 2       9,000  
Net gains (losses) on Level 3 assets (realized and unrealized) (802) (5,416) (316) (4,193)  
Other asset-backed securities          
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]          
Transfers of assets from Level 2 to Level 3 7,600 15,900 10,800    
Transfers of assets from Level 3 to Level 2     22,300    
Net gains (losses) on Level 3 assets (realized and unrealized) 3,070 (4,001) (1,014) (5,476)  
Investments at fair value          
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]          
Transfers of assets from Level 3 to Level 2 39,800   40,200    
Net gains (losses) on Level 3 assets (realized and unrealized) 35,594 (807) 29,454 1,483  
Structured Notes          
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]          
Transfers of liabilities from Level 2 to Level 3 9,500   10,300    
Transfers of liabilities from Level 3 to Level 2 91,000   52,300    
Derivatives          
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]          
Transfers of liabilities from Level 2 to Level 3 41,500   58,700    
Transfers of liabilities from Level 3 to Level 2 14,400        
Net gains (losses) on Level 3 liabilities (realized and unrealized) (14,760) (1,580) (29,079) (668)  
Long-term debt          
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]          
Transfers of liabilities from Level 2 to Level 3   158,100   107,400  
Net gains (losses) on Level 3 liabilities (realized and unrealized)   $ (20,838)   $ (28,082)  
Net gains (losses) on Level 3 liabilities (realized and unrealized), included in earnings and OCI $ 1,163   $ (12,854)