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SECURITIES - Schedule of Available for Sale Securities Debt Maturities (Details)
$ in Millions
Mar. 31, 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 $ 16
Amortized Cost, Debt securities available for sale, Maturity of 1-5 Years 105
Amortized Cost, Debt securities available for sale, Maturity of 5-10 Years 1,120
Amortized Cost, Debt securities available for sale, Maturity After 10 Years 18,951
Amortized Cost, Debt securities available for sale, Total 20,192
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 4,992
Amortized Cost, Debt securities held to maturity, Total 4,992
Total amortized cost of debt securities, Maturity of 1 Year or Less 16
Total amortized cost of debt securities, Maturity of 1-5 Years 105
Total amortized cost of debt securities, Maturity of 5-10 Years 1,120
Total amortized cost of debt securities, Maturity After 10 Years 23,943
Total amortized cost of debt securities, Total 25,184
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 16
Fair Value, Debt securities available for sale, Maturity of 1-5 Years 105
Fair Value, Debt securities available for sale, Maturity of 5-10 Years 1,134
Fair Value, Debt securities available for sale, Maturity After 10 Years 18,709
Fair Value, Debt securities available for sale, Total 19,964
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 4,995
Fair Value, Debt securities held to maturity, Total 4,995
Total fair value of debt securities, Maturity of 1 Year or Less 16
Total fair value of debt securities, Maturity of 1-5 Years 105
Total fair value of debt securities, Maturity of 5-10 Years 1,134
Total fair value of debt securities, Maturity After 10 Years 23,704
Total fair value of debt securities, Total 24,959
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 15
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 15
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 15
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 15
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 74
Amortized Cost, Debt securities available for sale, Maturity of 5-10 Years 1,118
Amortized Cost, Debt securities available for sale, Maturity After 10 Years 18,580
Amortized Cost, Debt securities available for sale, Total 19,773
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 4,075
Amortized Cost, Debt securities held to maturity, Total 4,075
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 74
Fair Value, Debt securities available for sale, Maturity of 5-10 Years 1,132
Fair Value, Debt securities available for sale, Maturity After 10 Years 18,355
Fair Value, Debt securities available for sale, Total 19,562
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 4,054
Fair Value, Debt securities held to maturity, Total 4,054
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 31
Amortized Cost, Debt securities available for sale, Maturity of 5-10 Years 2
Amortized Cost, Debt securities available for sale, Maturity After 10 Years 364
Amortized Cost, Debt securities available for sale, Total 397
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 917
Amortized Cost, Debt securities held to maturity, Total 917
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 31
Fair Value, Debt securities available for sale, Maturity of 5-10 Years 2
Fair Value, Debt securities available for sale, Maturity After 10 Years 347
Fair Value, Debt securities available for sale, Total 380
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 941
Fair Value, Debt securities held to maturity, Total $ 941