Quarterly report pursuant to Section 13 or 15(d)

OTHER SECURITIES (Details)

v3.10.0.1
OTHER SECURITIES (Details) - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Schedule of Other Securities [Line Items]    
Other Securities, Amortized Cost Basis $ 596 $ 600
Other Securities, Fair Value 597 600
Mutual Fund [Member]    
Schedule of Other Securities [Line Items]    
Other Securities, Amortized Cost Basis 19 18
Other Securities, Fair Value 19 18
Marketable equity securities    
Schedule of Other Securities [Line Items]    
Other Securities, Amortized Cost Basis 1 1
Other Securities, Fair Value 2 1
Investment in Federal Home Loan Bank Stock [Member] | Nonmarketable equity securities [Member]    
Schedule of Other Securities [Line Items]    
Other Securities, Amortized Cost Basis 282 287
Other Securities, Fair Value 282 287
Investment in Federal Reserve Stock [Member] | Nonmarketable equity securities [Member]    
Schedule of Other Securities [Line Items]    
Other Securities, Amortized Cost Basis 294 294
Other Securities, Fair Value $ 294 $ 294