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FAIR VALUE ELECTIONS - Valuation Adjustments, Fair Value Option for Financial Assets and Financial Liabilities (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
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 $ 1,415 $ (680)
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) (27) 10
Certain loans and other credit product | Trading assets    
Fair Value Option Quantitative Disclosures    
Aggregate unpaid principal balance in excess of fair value 435 623
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 fair value 741 682
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 400 900
Certain Investments in Unallocated Precious Metals | Forward derivative contract | Purchased    
Fair Value Option Quantitative Disclosures    
Derivative notionals 13,700  
Certain Investments in Unallocated Precious Metals | Forward derivative contract | Sold    
Fair Value Option Quantitative Disclosures    
Derivative notionals 10,300  
Mortgage loans    
Fair Value Option Quantitative Disclosures    
Aggregate unpaid principal balance in excess of fair value 21 14
Carrying amount | Certain loans and other credit product | Trading assets    
Fair Value Option Quantitative Disclosures    
Carrying amount reported on the Consolidated Balance Sheet 10,108 8,851
Carrying amount | Certain loans and other credit product | Loans    
Fair Value Option Quantitative Disclosures    
Carrying amount reported on the Consolidated Balance Sheet 3,224 4,374
Carrying amount | Certain mortgage loans (HFS)    
Fair Value Option Quantitative Disclosures    
Carrying amount reported on the Consolidated Balance Sheet 556 426
Fair value | Certain loans and other credit product    
Fair Value Option Quantitative Disclosures    
Unfunded lending commitments $ 1,137 $ 508