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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 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 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 $ (377) $ (195) $ 208 $ (422)  
Balance of non-accrual loans or loans more than 90 days past due 0   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   0
Certain loans and other credit product          
Fair Value Option Quantitative Disclosures          
Changes in fair value due to instrument-specific credit risk gain (loss)     (13) $ 57  
Certain loans and other credit product | Trading assets          
Fair Value Option Quantitative Disclosures          
Aggregate unpaid principal balance in excess of (less than) fair value 432   432   623
Balance of non-accrual loans or loans more than 90 days past due 0   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   0
Certain loans and other credit product | Loans          
Fair Value Option Quantitative Disclosures          
Aggregate unpaid principal balance in excess of (less than) fair value 538   538   682
Balance of non-accrual loans or loans more than 90 days past due 1   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   1
Certain debt host contracts across unallocated precious metals accounts          
Fair Value Option Quantitative Disclosures          
Carrying amount reported on the Consolidated Balance Sheet 400   400   900
Certain Investments in Unallocated Precious Metals | Forward derivative contract | Purchased          
Fair Value Option Quantitative Disclosures          
Derivative notionals 12,000   12,000    
Certain Investments in Unallocated Precious Metals | Forward derivative contract | Sold          
Fair Value Option Quantitative Disclosures          
Derivative notionals 10,600   10,600    
Mortgage receivable          
Fair Value Option Quantitative Disclosures          
Aggregate unpaid principal balance in excess of (less than) fair value 9   9   14
Carrying amount | Certain loans and other credit product | Trading assets          
Fair Value Option Quantitative Disclosures          
Carrying amount reported on the Consolidated Balance Sheet 8,922   8,922   8,851
Carrying amount | Certain loans and other credit product | Loans          
Fair Value Option Quantitative Disclosures          
Carrying amount reported on the Consolidated Balance Sheet 4,239   4,239   4,374
Carrying amount | Loans held-for-sale          
Fair Value Option Quantitative Disclosures          
Carrying amount reported on the Consolidated Balance Sheet 480   480   426
Fair value | Certain loans and other credit product          
Fair Value Option Quantitative Disclosures          
Unfunded lending commitments $ 1,043   $ 1,043   $ 508