Quarterly report pursuant to Section 13 or 15(d)

OTHER SECURITIES (Details)

v3.10.0.1
OTHER SECURITIES (Details) - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
Schedule of Other Securities [Line Items]    
Other Securities, Amortized Cost Basis $ 564 $ 600
Other securities 565 600
Mutual Fund    
Schedule of Other Securities [Line Items]    
Other Securities, Amortized Cost Basis 20 18
Other securities 20 18
Marketable equity securities    
Schedule of Other Securities [Line Items]    
Other Securities, Amortized Cost Basis 1 1
Other securities 2 1
Investment in Federal Home Loan Bank Stock | Nonmarketable equity securities    
Schedule of Other Securities [Line Items]    
Other Securities, Amortized Cost Basis 248 287
Other securities 248 287
Investment in Federal Reserve Stock | Nonmarketable equity securities    
Schedule of Other Securities [Line Items]    
Other Securities, Amortized Cost Basis 295 294
Other securities $ 295 $ 294