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Fair Value Measurements - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Jun. 30, 2020
Dec. 31, 2019
Jun. 30, 2019
Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]                
Unfunded commitments, equity securities measured at net asset value $ 34   $ 34     $ 41    
Revaluation period     90 days          
Deferred fees 3   $ 3     2    
Derivative financial assets [Member]                
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]                
Fair value of level 3 assets 343 $ 436 343 $ 436        
Derivative financial liabilities [Member]                
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]                
Fair value of level 3 liabilities [1] 239 352 239 352        
Level 3 [Member]                
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]                
Fair value of level 3 assets 246 896 246 896 $ 754 703 $ 898 $ 2,088
Fair value of level 3 liabilities 1,022 1,189 1,022 1,189 1,019 1,128 1,371 1,337
Fair Value Assets, Transfers Into Level 3 20 (21) 28 (21)        
Fair Value Assets, Transfers Out of Level 3 (1) 4 1 (2)        
Fair Value Liability, Transfers Into Level 3 1 1 1 6        
Fair Value Liability, Transfers Out of Level 3 11 128 75 278        
Level 3 [Member] | Equity contracts [Member]                
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]                
Derivatives, net, Transfers out of Level 3 [2] (1) 4 1 3        
Unfunded Loan Commitment [Member]                
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]                
Deferred fees 142   142     162    
Deposits [Member] | Level 3 [Member]                
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]                
Fair value of level 3 liabilities [1] 650 [3],[4] 853 650 [3],[4] 853 672 774 [3],[4] 930 925
Fair Value Liability, Transfers Into Level 3 [1] 0 1 0 6        
Fair Value Liability, Transfers Out of Level 3 [1] 8 83 56 186        
Long-term debt [Member] | Level 3 [Member]                
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]                
Fair value of level 3 liabilities [1] 372 [3],[4] 336 372 [3],[4] 336 347 354 [3],[4] 441 412
Fair Value Liability, Transfers Into Level 3 [1] 1 0 1 0        
Fair Value Liability, Transfers Out of Level 3 [1] 3 45 19 92        
Collateralized debt obligations [Member] | Level 3 [Member] | Trading assets, excluding derivatives [Member]                
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]                
Fair value of level 3 assets [5]   84   84     86 100
Fair Value Assets, Transfers Into Level 3 [5]   0   0        
Fair Value Assets, Transfers Out of Level 3 [5]   0   0        
Residential mortgage asset-backed securities [Member] | Level 3 [Member] | Trading assets, excluding derivatives [Member]                
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]                
Fair value of level 3 assets [5] 15 17 15 17 $ 15 $ 17 16 16
Fair Value Assets, Transfers Into Level 3 0 [5] 0 [5] 0 0 [5]        
Fair Value Assets, Transfers Out of Level 3 [5] $ 0 0 $ 0 0        
Student loan asset-backed securities [Member] | Level 3 [Member] | Trading assets, excluding derivatives [Member]                
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]                
Fair value of level 3 assets [5]   86   86     $ 90 $ 92
Fair Value Assets, Transfers Into Level 3 [5]   0   0        
Fair Value Assets, Transfers Out of Level 3 [5]   $ 0   $ 0        
[1] Excluding unrealized gains (losses) on fair value option liabilities attributable to our own credit spread, which are recorded in other comprehensive income, gains (losses) on fair value option liabilities are included in gain (loss) on instruments designated at fair value and related derivatives in the consolidated statement of income (loss).
[2] Level 3 net derivatives included derivative assets of $343 million and derivative liabilities of $239 million at September 30, 2020 and derivative assets of $436 million and derivative liabilities of $352 million at September 30, 2019. Gains (losses) on derivatives, net are predominantly included in trading revenue and gain (loss) on instruments designated at fair value and related derivatives in the consolidated statement of income (loss).
[3] Structured deposits and structured notes contain embedded derivative features whose fair value measurements contain significant Level 3 inputs. See equity and foreign exchange derivatives below for a discussion of the uncertainty of Level 3 inputs related to structured deposits and structured notes.
[4] We are the client-facing entity and we enter into identical but opposite derivatives to transfer the resultant risks to our affiliates. With the exception of counterparty credit risks, we are market neutral. The corresponding intra-group derivatives are presented as equity derivatives and foreign exchange derivatives in the table.
[5] Gains (losses) on trading assets, excluding derivatives are included in trading revenue in the consolidated statement of income (loss).