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Fair Value Measurements - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]        
Fair Value, Assets, Level 2 to Level 1 Transfers, Amount $ 0   $ 0  
Average deviation of implied volatility, foreign currency pair 1.00%      
Average deviation of implied volatility, at-the-money equity option 5.00%      
Revaluation period 90 days      
Unfunded commitments, equity securities measured at net asset value $ 34   43  
Derivative Assets [Member]        
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]        
Fair value of level 3 assets 281 $ 343    
Derivative Liabilities [Member]        
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]        
Fair value of level 3 liabilities [1] $ 185 167    
Residential Mortgage [Member] | Weighted Average [Member]        
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]        
Fair Value Inputs, Loss Severity 69.00%      
Impaired commercial loans [Member] | Weighted Average [Member]        
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]        
Fair Value Inputs, Loss Severity 25.00%      
Level 3 [Member]        
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]        
Fair value of level 3 assets $ 2,152 3,351 2,207 $ 3,356
Fair value of level 3 liabilities 1,546 1,774 1,538 1,906
Fair Value Assets, Transfers Into Level 3 0 0    
Fair Value Assets, Transfers Out of Level 3 0 0    
Fair Value Liability, Transfers Into Level 3 3 5    
Fair Value Liability, Transfers Out of Level 3 78 89    
Level 3 [Member] | Domestic Deposits [Member]        
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]        
Fair value of level 3 liabilities [1] 916 1,216 897 1,407
Fair Value Liability, Transfers Into Level 3 [1] 3 3    
Fair Value Liability, Transfers Out of Level 3 [1] 34 46    
Level 3 [Member] | Borrowings [Member]        
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]        
Fair value of level 3 liabilities [1] 630 558 641 499
Fair Value Liability, Transfers Into Level 3 [1] 0 2    
Fair Value Liability, Transfers Out of Level 3 [1] 44 43    
Other asset-backed securities available-for-sale [Member] | Level 3 [Member]        
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]        
Fair value of level 3 assets [2] 107 107 111 $ 105
Fair Value Assets, Transfers Into Level 3 [2] 0 0    
Fair Value Assets, Transfers Out of Level 3 [2] 0 $ 0    
Unfunded Loan Commitment [Member] | Standby Letters of Credit [Member]        
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]        
Deferred fees on commitments and standby letters of credit $ 156   $ 158  
Fair Value, Measurements, Recurring [Member] | Domestic Deposits [Member] | Option adjusted discounted cash flows [Member] | Minimum [Member]        
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]        
Fair Value Inputs, Implied Volatility Currency Pairs [3],[4] 6.00%   6.00%  
Fair Value Inputs, Equity/Equity Index Volatility [3],[4] 7.00%   7.00%  
Fair Value Inputs, Equity/Equity and Equity/Index Correlation 42.00%   42.00%  
Fair Value, Measurements, Recurring [Member] | Domestic Deposits [Member] | Option adjusted discounted cash flows [Member] | Maximum [Member]        
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]        
Fair Value Inputs, Implied Volatility Currency Pairs [3],[4] 9.00%   9.00%  
Fair Value Inputs, Equity/Equity Index Volatility [3],[4] 31.00%   42.00%  
Fair Value Inputs, Equity/Equity and Equity/Index Correlation 52.00%   80.00%  
Fair Value, Measurements, Recurring [Member] | Borrowings [Member] | Option adjusted discounted cash flows [Member] | Minimum [Member]        
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]        
Fair Value Inputs, Implied Volatility Currency Pairs [3],[4] 6.00%   6.00%  
Fair Value Inputs, Equity/Equity Index Volatility [3],[4] 7.00%   7.00%  
Fair Value Inputs, Equity/Equity and Equity/Index Correlation [3],[4] 42.00%   42.00%  
Fair Value, Measurements, Recurring [Member] | Borrowings [Member] | Option adjusted discounted cash flows [Member] | Maximum [Member]        
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]        
Fair Value Inputs, Implied Volatility Currency Pairs [3],[4] 9.00%   9.00%  
Fair Value Inputs, Equity/Equity Index Volatility [3],[4] 31.00%   42.00%  
Fair Value Inputs, Equity/Equity and Equity/Index Correlation [3],[4] 78.00%   80.00%  
[1] unrealized gains (losses) on fair value option liabilities attributable to our own credit spread, which are recorded in other comprehensive income (loss), gains (losses) on fair value option liabilities are included in gain on instruments designated at fair value and related derivatives in the consolidated statement of income (loss).
[2] Realized gains (losses) on securities available-for-sale are included in other securities gains, net in the consolidated statement of income (loss). Unrealized gains (losses) on securities available-for-sale are included in other comprehensive income (loss).
[3] Structured deposits and structured notes contain embedded derivative features whose fair value measurements contain significant Level 3 inputs.
[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.