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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, 2018
Mar. 31, 2017
Dec. 31, 2017
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 $ 167 $ (95)  
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 19 $ 26  
Certain loans and other credit product | Trading assets      
Fair Value Option Quantitative Disclosures      
Aggregate unpaid principal balance in excess of (less than) fair value 475   623
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 870   682
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   1
Certain debt host contracts across unallocated precious metals accounts      
Fair Value Option Quantitative Disclosures      
Carrying amount reported on the Consolidated Balance Sheet 700   900
Certain Investments in Unallocated Precious Metals | Forward derivative contract | Purchased      
Fair Value Option Quantitative Disclosures      
Derivative notionals 12,000    
Certain Investments in Unallocated Precious Metals | Forward derivative contract | Sold      
Fair Value Option Quantitative Disclosures      
Derivative notionals 10,100    
Mortgage receivable      
Fair Value Option Quantitative Disclosures      
Aggregate unpaid principal balance in excess of (less than) fair value 7   14
Carrying amount | Certain loans and other credit product | Trading assets      
Fair Value Option Quantitative Disclosures      
Carrying amount reported on the Consolidated Balance Sheet 9,194   8,851
Carrying amount | Certain loans and other credit product | Loans      
Fair Value Option Quantitative Disclosures      
Carrying amount reported on the Consolidated Balance Sheet 4,536   4,374
Carrying amount | Loans held-for-sale      
Fair Value Option Quantitative Disclosures      
Carrying amount reported on the Consolidated Balance Sheet 333   426
Fair value | Certain loans and other credit product      
Fair Value Option Quantitative Disclosures      
Unfunded lending commitments $ 408   $ 508