Annual report pursuant to Section 13 and 15(d)

HELD-TO-MATURITY SECURITIES - Narrative (Details)

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HELD-TO-MATURITY SECURITIES - Narrative (Details) - USD ($)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Held-to-maturity Securities [Abstract]    
Available-for-sale securities transferred to held-to-maturity securities $ 3,000,000,000  
Unrealized net losses recognized in OCI at time of transfer of available-for-sale securities transferred to held-to-maturity securities 6,000,000  
Other than temporary impairment losses, held-to-maturity $ 0 $ 0