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FAIR VALUE ELECTIONS - Valuation Adjustments, Fair Value Option for Financial Assets and Financial Liabilities (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Fair Value Option Quantitative Disclosures      
Gain (loss) on change in estimated fair value of debt liabilities due to change in company's own credit risk $ (725) $ 167  
Balance of non-accrual loans or loans more than 90 days past due 0   $ 0
Aggregate unpaid principal balance in excess of fair value for non-accrual loans or loans more than 90 days past due 0   0
Certain loans and other credit product      
Fair Value Option Quantitative Disclosures      
Changes in fair value due to instrument-specific credit risk gain (loss) 18 $ (19)  
Certain loans and other credit product | Trading assets      
Fair Value Option Quantitative Disclosures      
Aggregate unpaid principal balance in excess of (less than) fair value 870   435
Balance of non-accrual loans or loans more than 90 days past due 0   0
Aggregate unpaid principal balance in excess of fair value for non-accrual loans or loans more than 90 days past due 0   0
Certain loans and other credit product | Loans      
Fair Value Option Quantitative Disclosures      
Aggregate unpaid principal balance in excess of (less than) fair value 750   741
Balance of non-accrual loans or loans more than 90 days past due 1   1
Aggregate unpaid principal balance in excess of fair value for non-accrual loans or loans more than 90 days past due 0   0
Certain debt host contracts across unallocated precious metals accounts      
Fair Value Option Quantitative Disclosures      
Carrying amount reported on the Consolidated Balance Sheet 500   400
Certain Investments in Unallocated Precious Metals | Forward derivative contract | Purchased      
Fair Value Option Quantitative Disclosures      
Derivative notionals 9,600    
Certain Investments in Unallocated Precious Metals | Forward derivative contract | Sold      
Fair Value Option Quantitative Disclosures      
Derivative notionals 6,900    
Mortgage receivable      
Fair Value Option Quantitative Disclosures      
Aggregate unpaid principal balance in excess of (less than) fair value 18   21
Carrying amount | Certain loans and other credit product | Trading assets      
Fair Value Option Quantitative Disclosures      
Carrying amount reported on the Consolidated Balance Sheet 9,287   10,108
Carrying amount | Certain loans and other credit product | Loans      
Fair Value Option Quantitative Disclosures      
Carrying amount reported on the Consolidated Balance Sheet 3,874   3,224
Carrying amount | Loans held-for-sale      
Fair Value Option Quantitative Disclosures      
Carrying amount reported on the Consolidated Balance Sheet 459   556
Fair value | Certain loans and other credit product      
Fair Value Option Quantitative Disclosures      
Unfunded lending commitments $ 1,142   $ 1,137