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FAIR VALUE MEASUREMENTS - Residential and Commercial Mortgage Loans Held For Sale (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Aggregate Fair Value $ 205   $ 205   $ 176
Mortgage banking noninterest income (loss) 21 20 55 133  
Residential loans held for sale
         
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Mortgage banking noninterest income (loss) (2) 10 3 (26)  
Level 2 | Residential loans held for sale
         
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Aggregate Fair Value 189   189   176
Aggregate Unpaid Principal 183   183   173
Aggregate Fair Value Less Aggregate Unpaid Principal 6   6   3
Level 2 | Commercial real estate loans held for sale
         
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Aggregate Fair Value 16   16    
Aggregate Unpaid Principal 16   16    
Aggregate Fair Value Less Aggregate Unpaid Principal $ 0   $ 0