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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 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 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 $ 3 $ 418 $ (722) $ 585  
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)     53 $ (20)  
Certain loans and other credit product | Trading assets          
Fair Value Option Quantitative Disclosures          
Aggregate unpaid principal balance in excess of (less than) fair value 410   410   435
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 779   779   741
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   0
Certain debt host contracts across unallocated precious metals accounts          
Fair Value Option Quantitative Disclosures          
Carrying amount reported on the Consolidated Balance Sheet 800   800   400
Certain Investments in Unallocated Precious Metals | Forward derivative contract | Purchased          
Fair Value Option Quantitative Disclosures          
Derivative notionals 9,600   9,600    
Certain Investments in Unallocated Precious Metals | Forward derivative contract | Sold          
Fair Value Option Quantitative Disclosures          
Derivative notionals 7,200   7,200    
Mortgage receivable          
Fair Value Option Quantitative Disclosures          
Aggregate unpaid principal balance in excess of (less than) fair value 21   21   21
Carrying amount | Certain loans and other credit product | Trading assets          
Fair Value Option Quantitative Disclosures          
Carrying amount reported on the Consolidated Balance Sheet 8,448   8,448   10,108
Carrying amount | Certain loans and other credit product | Loans          
Fair Value Option Quantitative Disclosures          
Carrying amount reported on the Consolidated Balance Sheet 3,824   3,824   3,224
Carrying amount | Loans held-for-sale          
Fair Value Option Quantitative Disclosures          
Carrying amount reported on the Consolidated Balance Sheet 648   648   556
Fair value | Certain loans and other credit product          
Fair Value Option Quantitative Disclosures          
Unfunded lending commitments $ 1,057   $ 1,057   $ 1,137