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INVESTMENTS - Debt Securities Held-to-Maturity (Details) - USD ($)
$ in Millions
 3 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Schedule of Held-to-maturity Securities      
Fair value of AFS Securities transfered to HTM $ 7,100 $ 11,800  
Debt Securities Held-to-maturity      
Amortized cost 30,752   $ 24,701
Net unrealized gains (losses) recognized in AOCI (586)   (780)
Carrying value 30,166   23,921
Gross unrecognized gains 848   1,111
Gross unrecognized losses (531)   (361)
Fair value 30,483   24,671
Mortgage-backed securities - U.S. agency-sponsored      
Schedule of Held-to-maturity Securities      
Fair value of AFS Securities transfered to HTM 7,000 5,400  
Debt Securities Held-to-maturity      
Amortized cost 16,060   8,795
Net unrealized gains (losses) recognized in AOCI 146   95
Carrying value 16,206   8,890
Gross unrecognized gains 74   106
Gross unrecognized losses (98)   (6)
Fair value 16,182   8,990
Mortgage-backed securities - Prime      
Debt Securities Held-to-maturity      
Amortized cost 57   60
Net unrealized gains (losses) recognized in AOCI (11)   (12)
Carrying value 46   48
Gross unrecognized gains 4   6
Gross unrecognized losses 0   (1)
Fair value 50   53
Mortgage-backed securities - Alt-A      
Debt Securities Held-to-maturity      
Amortized cost 1,026   1,125
Net unrealized gains (losses) recognized in AOCI (182)   (213)
Carrying value 844   912
Gross unrecognized gains 497   537
Gross unrecognized losses (304)   (287)
Fair value 1,037   1,162
Mortgage-backed securities - Subprime      
Debt Securities Held-to-maturity      
Amortized cost 5   6
Net unrealized gains (losses) recognized in AOCI 0   (1)
Carrying value 5   5
Gross unrecognized gains 14   15
Gross unrecognized losses 0   0
Fair value 19   20
Mortgage-backed securities - Non-U.S. residential      
Debt Securities Held-to-maturity      
Amortized cost 619   983
Net unrealized gains (losses) recognized in AOCI (88)   (137)
Carrying value 531   846
Gross unrecognized gains 53   92
Gross unrecognized losses 0   0
Fair value 584   938
Mortgage-backed securities - Commercial      
Debt Securities Held-to-maturity      
Amortized cost 8   8
Net unrealized gains (losses) recognized in AOCI 0   0
Carrying value 8   8
Gross unrecognized gains 0   1
Gross unrecognized losses 0   0
Fair value 8   9
Mortgage-backed securities      
Debt Securities Held-to-maturity      
Amortized cost 17,775   10,977
Net unrealized gains (losses) recognized in AOCI (135)   (268)
Carrying value 17,640   10,709
Gross unrecognized gains 642   757
Gross unrecognized losses (402)   (294)
Fair value 17,880   11,172
State and municipal securities      
Schedule of Held-to-maturity Securities      
Fair value of AFS Securities transfered to HTM 100 $ 6,400  
Debt Securities Held-to-maturity      
Amortized cost 8,695   8,443
Net unrealized gains (losses) recognized in AOCI (435)   (494)
Carrying value 8,260   7,949
Gross unrecognized gains 117   227
Gross unrecognized losses (128)   (57)
Fair value 8,249   8,119
Foreign government      
Debt Securities Held-to-maturity      
Amortized cost 3,945   4,725
Net unrealized gains (losses) recognized in AOCI 0   0
Carrying value 3,945   4,725
Gross unrecognized gains 42   77
Gross unrecognized losses 0   0
Fair value 3,987   4,802
Asset-backed securities      
Debt Securities Held-to-maturity      
Amortized cost 337   556
Net unrealized gains (losses) recognized in AOCI (16)   (18)
Carrying value 321   538
Gross unrecognized gains 47   50
Gross unrecognized losses (1)   (10)
Fair value $ 367   $ 578