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INVESTMENTS - Carrying Value and Fair Value of HTM Debt Securities by Contractual Maturity Dates (Details) - USD ($)
$ in Millions
Dec. 31, 2015
Dec. 31, 2014
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount;    
Carrying value $ 36,215 $ 23,921
Held-to-maturity Securities, Debt Maturities, Fair Value;    
Fair value 36,511 24,671
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 172 0
After 5 but within 10 years, carrying value 660 863
After 10 years, carrying value 18,701 9,846
Carrying value 19,533 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 172 0
After 5 but within 10 years, fair value 663 869
After 10 years, fair value 18,818 10,303
Fair value 19,653 11,172
State and municipal securities    
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount;    
Due within 1 year, carrying value 309 205
After 1 but within 5 years, carrying value 336 243
After 5 but within 10 years, carrying value 262 140
After 10 years, carrying value 7,236 7,361
Carrying value 8,143 7,949
Held-to-maturity Securities, Debt Maturities, Fair Value;    
Due within 1 year, fair value 305 205
After 1 but within 5 years, fair value 335 243
After 5 but within 10 years, fair value 270 144
After 10 years, fair value 7,391 7,527
Fair value 8,301 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 4,068 4,725
After 5 but within 10 years, carrying value 0 0
After 10 years, carrying value 0 0
Carrying value 4,068 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 4,093 4,802
After 5 but within 10 years, fair value 0 0
After 10 years, fair value 0 0
Fair value 4,093 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 4,471 538
Carrying value 4,471 538
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 4,464 578
Fair value $ 4,464 $ 578