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INVESTMENTS - Carrying Value and Fair Value of HTM Debt Securities by Contractual Maturity Dates (Details) - USD ($)
$ in Millions
Jun. 30, 2015
Dec. 31, 2014
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount;    
Carrying value $ 30,166 $ 23,921
Held-to-maturity Securities, Debt Maturities, Fair Value;    
Fair value 30,483 $ 24,671
Akbank    
Held-to-maturity Securities, Debt Maturities, Fair Value;    
Equity investment ownership percentage   9.90%
Mortgage-backed securities    
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount;    
Due within 1 year, carrying value 0 $ 0
After 1 but within 5 years, carrying value 8 0
After 5 but within 10 years, carrying value 821 863
After 10 years, carrying value 16,811 9,846
Carrying value 17,640 10,709
Held-to-maturity Securities, Debt Maturities, Fair Value;    
Due within 1 year, fair value 0 0
After 1 but within 5 years, fair value 8 0
After 5 but within 10 years, fair value 827 869
After 10 years, fair value 17,045 10,303
Fair value 17,880 11,172
State and municipal securities    
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount;    
Due within 1 year, carrying value 266 205
After 1 but within 5 years, carrying value 294 243
After 5 but within 10 years, carrying value 172 140
After 10 years, carrying value 7,528 7,361
Carrying value 8,260 7,949
Held-to-maturity Securities, Debt Maturities, Fair Value;    
Due within 1 year, fair value 265 205
After 1 but within 5 years, fair value 295 243
After 5 but within 10 years, fair value 176 144
After 10 years, fair value 7,513 7,527
Fair value 8,249 8,119
Foreign government    
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount;    
Due within 1 year, carrying value 0 0
After 1 but within 5 years, carrying value 3,945 4,725
After 5 but within 10 years, carrying value 0 0
After 10 years, carrying value 0 0
Carrying value 3,945 4,725
Held-to-maturity Securities, Debt Maturities, Fair Value;    
Due within 1 year, fair value 0 0
After 1 but within 5 years, fair value 3,987 4,802
After 5 but within 10 years, fair value 0 0
After 10 years, fair value 0 0
Fair value 3,987 4,802
All other    
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount;    
Due within 1 year, carrying value 0 0
After 1 but within 5 years, carrying value 0 0
After 5 but within 10 years, carrying value 0 0
After 10 years, carrying value 321 538
Carrying value 321 538
Held-to-maturity Securities, Debt Maturities, Fair Value;    
Due within 1 year, fair value 0 0
After 1 but within 5 years, fair value 0 0
After 5 but within 10 years, fair value 0 0
After 10 years, fair value 367 578
Fair value $ 367 $ 578