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INVESTMENTS - Debt Securities Held-to-Maturity (Details) - USD ($)
$ in Millions
 3 Months Ended
Jun. 30, 2015
Sep. 30, 2015
Dec. 31, 2014
Debt Securities Held-to-maturity      
Amortized cost   $ 34,417 $ 24,701
Net unrealized gains (losses) recognized in AOCI   (477) (780)
Carrying value   33,940 23,921
Gross unrecognized gains   840 1,111
Gross unrecognized losses   (281) (361)
Fair value   34,499 24,671
Fair value of securities transferred from AFS to HTM $ 7,100    
Mortgage-backed securities - U.S. agency-sponsored      
Debt Securities Held-to-maturity      
Amortized cost   17,573 8,795
Net unrealized gains (losses) recognized in AOCI   142 95
Carrying value   17,715 8,890
Gross unrecognized gains   183 106
Gross unrecognized losses   (7) (6)
Fair value   17,891 8,990
Fair value of securities transferred from AFS to HTM 7,000    
Mortgage-backed securities - Prime      
Debt Securities Held-to-maturity      
Amortized cost   55 60
Net unrealized gains (losses) recognized in AOCI   (11) (12)
Carrying value   44 48
Gross unrecognized gains   3 6
Gross unrecognized losses   (1) (1)
Fair value   46 53
Mortgage-backed securities - Alt-A      
Debt Securities Held-to-maturity      
Amortized cost   526 1,125
Net unrealized gains (losses) recognized in AOCI   (75) (213)
Carrying value   451 912
Gross unrecognized gains   344 537
Gross unrecognized losses   (162) (287)
Fair value   633 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   506 983
Net unrealized gains (losses) recognized in AOCI   (68) (137)
Carrying value   438 846
Gross unrecognized gains   44 92
Gross unrecognized losses   0 0
Fair value   482 938
Mortgage-backed securities - Commercial      
Debt Securities Held-to-maturity      
Amortized cost   0 8
Net unrealized gains (losses) recognized in AOCI   0 0
Carrying value   0 8
Gross unrecognized gains   0 1
Gross unrecognized losses   0 0
Fair value   0 9
Mortgage-backed securities      
Debt Securities Held-to-maturity      
Amortized cost   18,665 10,977
Net unrealized gains (losses) recognized in AOCI   (12) (268)
Carrying value   18,653 10,709
Gross unrecognized gains   588 757
Gross unrecognized losses   (170) (294)
Fair value   19,071 11,172
State and municipal securities      
Debt Securities Held-to-maturity      
Amortized cost   8,713 8,443
Net unrealized gains (losses) recognized in AOCI   (450) (494)
Carrying value   8,263 7,949
Gross unrecognized gains   175 227
Gross unrecognized losses   (99) (57)
Fair value   8,339 8,119
Fair value of securities transferred from AFS to HTM $ 100    
Foreign government      
Debt Securities Held-to-maturity      
Amortized cost   4,274 4,725
Net unrealized gains (losses) recognized in AOCI   0 0
Carrying value   4,274 4,725
Gross unrecognized gains   35 77
Gross unrecognized losses   0 0
Fair value   4,309 4,802
Asset-backed securities      
Debt Securities Held-to-maturity      
Amortized cost   2,765 556
Net unrealized gains (losses) recognized in AOCI   (15) (18)
Carrying value   2,750 538
Gross unrecognized gains   42 50
Gross unrecognized losses   (12) (10)
Fair value   $ 2,780 $ 578