v3.19.2
Fair Value Disclosures - Changes in Level 3 Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]        
Assets measured at fair value, beginning balance $ 133 $ 147 $ 156 $ 116
Realized and Unrealized Gains (Losses),Assets (1)   (1)  
Purchases, Assets 4   57 31
Sales and Maturities, Assets   (12)   (12)
Transfers out of Level 3, Assets   (31) (76) (31)
Assets measured at fair value, ending balance 136 104 136 104
Total Net Unrealized Gains (Losses) Included in Earnings (1)   (1)  
Liabilities measured at fair value, beginning balance 409   371  
Realized and Unrealized Gains (Losses), Liabilities (13)   (19)  
Issuances and other Settlements, Liabilities (112)   (80)  
Liabilities measured at fair value, ending balance 310   310  
Total Net Unrealized Gains (Losses) Included in Earnings (13)   (19)  
Available-for-sale Securities [Member]        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]        
Assets measured at fair value, beginning balance   26    
Purchases, Assets       26
Transfers out of Level 3, Assets   (26)   (26)
Other Liabilities [Member]        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]        
Liabilities measured at fair value, beginning balance 275 242 287 236
Realized and Unrealized Gains (Losses), Liabilities (13) 3 (19) (3)
Issuances and other Settlements, Liabilities (120) (16) (138) (16)
Liabilities measured at fair value, ending balance 168 223 168 223
Total Net Unrealized Gains (Losses) Included in Earnings (13) 3 (19) (3)
Consolidated Variable Interest Entities [Member]        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]        
Assets measured at fair value, beginning balance 133   152  
Realized and Unrealized Gains (Losses),Assets (1)   (1)  
Purchases, Assets 2   55  
Transfers out of Level 3, Assets     (72)  
Assets measured at fair value, ending balance 134   134  
Total Net Unrealized Gains (Losses) Included in Earnings (1)   (1)  
Consolidated Variable Interest Entities [Member] | Borrowings [Member]        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]        
Liabilities measured at fair value, beginning balance 134   84  
Issuances and other Settlements, Liabilities 8   58  
Liabilities measured at fair value, ending balance 142   142  
Consolidated Variable Interest Entities [Member] | Bank Loans [Member]        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]        
Assets measured at fair value, beginning balance 123   70  
Purchases, Assets 2   55  
Assets measured at fair value, ending balance 125   125  
Consolidated Variable Interest Entities [Member] | Private/ Public Equity [Member]        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]        
Assets measured at fair value, beginning balance 10 116 82 116
Realized and Unrealized Gains (Losses),Assets (1)   (1)  
Sales and Maturities, Assets   (12)   (12)
Transfers out of Level 3, Assets     (72)  
Assets measured at fair value, ending balance 9 104 9 104
Total Net Unrealized Gains (Losses) Included in Earnings (1)   (1)  
Trading [Member]        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]        
Assets measured at fair value, beginning balance   5    
Purchases, Assets       5
Transfers out of Level 3, Assets   (5)   (5)
Trading [Member] | Debt securities [Member]        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]        
Assets measured at fair value, beginning balance     4  
Purchases, Assets 2   2  
Transfers out of Level 3, Assets     (4)  
Assets measured at fair value, ending balance 2   2  
Investments [Member]        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]        
Assets measured at fair value, beginning balance   31 4  
Purchases, Assets 2   2 31
Transfers out of Level 3, Assets   $ (31) (4) $ (31)
Assets measured at fair value, ending balance $ 2   $ 2