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SECURITIES - Schedule of Available for Sale Securities Debt Maturities (Details)
$ in Millions
Sep. 30, 2017
USD ($)
Available-for-sale Securities and Held-to-maturity Securities, Debt Maturities, Amortized Cost Basis [Abstract]  
Amortized Cost, Debt securities available for sale, Maturity of 1 Year or Less $ 13
Amortized Cost, Debt securities available for sale, Maturity of 1-5 Years 194
Amortized Cost, Debt securities available for sale, Maturity of 5-10 Years 1,149
Amortized Cost, Debt securities available for sale, Maturity After 10 Years 18,735
Amortized Cost, Debt securities available for sale, Total 20,091
Amortized Cost, Debt securities held to maturity, Maturity of 1 Year or Less 0
Amortized Cost, Debt securities held to maturity, Maturity of 1-5 Years 0
Amortized Cost, Debt securities held to maturity, Maturity of 5-10 Years 0
Amortized Cost, Debt securities held to maturity, Maturity After 10 Years 4,823
Amortized Cost, Debt securities held to maturity, Total 4,823
Total amortized cost of debt securities, Maturity of 1 Year or Less 13
Total amortized cost of debt securities, Maturity of 1-5 Years 194
Total amortized cost of debt securities, Maturity of 5-10 Years 1,149
Total amortized cost of debt securities, Maturity After 10 Years 23,558
Total amortized cost of debt securities, Total 24,914
Available-for-sale Securities and Held-to-maturity Securities, Debt Maturities, Fair Value [Abstract]  
Fair Value, Debt securities available for sale, Maturity of 1 Year or Less 13
Fair Value, Debt securities available for sale, Maturity of 1-5 Years 194
Fair Value, Debt securities available for sale, Maturity of 5-10 Years 1,166
Fair Value, Debt securities available for sale, Maturity After 10 Years 18,609
Fair Value, Debt securities available for sale, Total 19,982
Fair Value, Debt securities held to maturity, Maturity of 1 Year or Less 0
Fair Value, Debt securities held to maturity, Maturity of 1-5 Years 0
Fair Value, Debt securities held to maturity, Maturity of 5-10 Years 0
Fair Value, Debt securities held to maturity, Maturity After 10 Years 4,839
Fair Value, Debt securities held to maturity, Total 4,839
Total fair value of debt securities, Maturity of 1 Year or Less 13
Total fair value of debt securities, Maturity of 1-5 Years 194
Total fair value of debt securities, Maturity of 5-10 Years 1,166
Total fair value of debt securities, Maturity After 10 Years 23,448
Total fair value of debt securities, Total 24,821
U.S. Treasury and other  
Available-for-sale Securities and Held-to-maturity Securities, Debt Maturities, Amortized Cost Basis [Abstract]  
Amortized Cost, Debt securities available for sale, Maturity of 1 Year or Less 12
Amortized Cost, Debt securities available for sale, Maturity of 1-5 Years 0
Amortized Cost, Debt securities available for sale, Maturity of 5-10 Years 0
Amortized Cost, Debt securities available for sale, Maturity After 10 Years 0
Amortized Cost, Debt securities available for sale, Total 12
Available-for-sale Securities and Held-to-maturity Securities, Debt Maturities, Fair Value [Abstract]  
Fair Value, Debt securities available for sale, Maturity of 1 Year or Less 12
Fair Value, Debt securities available for sale, Maturity of 1-5 Years 0
Fair Value, Debt securities available for sale, Maturity of 5-10 Years 0
Fair Value, Debt securities available for sale, Maturity After 10 Years 0
Fair Value, Debt securities available for sale, Total 12
State and political subdivisions  
Available-for-sale Securities and Held-to-maturity Securities, Debt Maturities, Amortized Cost Basis [Abstract]  
Amortized Cost, Debt securities available for sale, Maturity of 1 Year or Less 0
Amortized Cost, Debt securities available for sale, Maturity of 1-5 Years 0
Amortized Cost, Debt securities available for sale, Maturity of 5-10 Years 0
Amortized Cost, Debt securities available for sale, Maturity After 10 Years 7
Amortized Cost, Debt securities available for sale, Total 7
Available-for-sale Securities and Held-to-maturity Securities, Debt Maturities, Fair Value [Abstract]  
Fair Value, Debt securities available for sale, Maturity of 1 Year or Less 0
Fair Value, Debt securities available for sale, Maturity of 1-5 Years 0
Fair Value, Debt securities available for sale, Maturity of 5-10 Years 0
Fair Value, Debt securities available for sale, Maturity After 10 Years 7
Fair Value, Debt securities available for sale, Total 7
Federal agencies and U.S. government sponsored entities  
Available-for-sale Securities and Held-to-maturity Securities, Debt Maturities, Amortized Cost Basis [Abstract]  
Amortized Cost, Debt securities available for sale, Maturity of 1 Year or Less 1
Amortized Cost, Debt securities available for sale, Maturity of 1-5 Years 169
Amortized Cost, Debt securities available for sale, Maturity of 5-10 Years 1,149
Amortized Cost, Debt securities available for sale, Maturity After 10 Years 18,416
Amortized Cost, Debt securities available for sale, Total 19,735
Amortized Cost, Debt securities held to maturity, Maturity of 1 Year or Less 0
Amortized Cost, Debt securities held to maturity, Maturity of 1-5 Years 0
Amortized Cost, Debt securities held to maturity, Maturity of 5-10 Years 0
Amortized Cost, Debt securities held to maturity, Maturity After 10 Years 3,966
Amortized Cost, Debt securities held to maturity, Total 3,966
Available-for-sale Securities and Held-to-maturity Securities, Debt Maturities, Fair Value [Abstract]  
Fair Value, Debt securities available for sale, Maturity of 1 Year or Less 1
Fair Value, Debt securities available for sale, Maturity of 1-5 Years 169
Fair Value, Debt securities available for sale, Maturity of 5-10 Years 1,166
Fair Value, Debt securities available for sale, Maturity After 10 Years 18,292
Fair Value, Debt securities available for sale, Total 19,628
Fair Value, Debt securities held to maturity, Maturity of 1 Year or Less 0
Fair Value, Debt securities held to maturity, Maturity of 1-5 Years 0
Fair Value, Debt securities held to maturity, Maturity of 5-10 Years 0
Fair Value, Debt securities held to maturity, Maturity After 10 Years 3,956
Fair Value, Debt securities held to maturity, Total 3,956
Other/non-agency  
Available-for-sale Securities and Held-to-maturity Securities, Debt Maturities, Amortized Cost Basis [Abstract]  
Amortized Cost, Debt securities available for sale, Maturity of 1 Year or Less 0
Amortized Cost, Debt securities available for sale, Maturity of 1-5 Years 25
Amortized Cost, Debt securities available for sale, Maturity of 5-10 Years 0
Amortized Cost, Debt securities available for sale, Maturity After 10 Years 312
Amortized Cost, Debt securities available for sale, Total 337
Amortized Cost, Debt securities held to maturity, Maturity of 1 Year or Less 0
Amortized Cost, Debt securities held to maturity, Maturity of 1-5 Years 0
Amortized Cost, Debt securities held to maturity, Maturity of 5-10 Years 0
Amortized Cost, Debt securities held to maturity, Maturity After 10 Years 857
Amortized Cost, Debt securities held to maturity, Total 857
Available-for-sale Securities and Held-to-maturity Securities, Debt Maturities, Fair Value [Abstract]  
Fair Value, Debt securities available for sale, Maturity of 1 Year or Less 0
Fair Value, Debt securities available for sale, Maturity of 1-5 Years 25
Fair Value, Debt securities available for sale, Maturity of 5-10 Years 0
Fair Value, Debt securities available for sale, Maturity After 10 Years 310
Fair Value, Debt securities available for sale, Total 335
Fair Value, Debt securities held to maturity, Maturity of 1 Year or Less 0
Fair Value, Debt securities held to maturity, Maturity of 1-5 Years 0
Fair Value, Debt securities held to maturity, Maturity of 5-10 Years 0
Fair Value, Debt securities held to maturity, Maturity After 10 Years 883
Fair Value, Debt securities held to maturity, Total $ 883