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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, 2015
Dec. 31, 2014
Debt Securities Held-to-maturity        
Amortized cost     $ 36,668 $ 24,701
Net unrealized gains (losses) recognized in AOCI     (453) (780)
Carrying value     36,215 23,921
Gross unrecognized gains     690 1,111
Gross unrecognized losses     (394) (361)
Fair value     36,511 24,671
Fair value of securities transferred from AFS to HTM $ 7,100 $ 11,800    
Mortgage-backed securities - U.S. agency-sponsored        
Debt Securities Held-to-maturity        
Amortized cost     17,648 8,795
Net unrealized gains (losses) recognized in AOCI     138 95
Carrying value     17,786 8,890
Gross unrecognized gains     71 106
Gross unrecognized losses     (100) (6)
Fair value     17,757 8,990
Fair value of securities transferred from AFS to HTM 7,000 5,400    
Mortgage-backed securities - Prime        
Debt Securities Held-to-maturity        
Amortized cost     121 60
Net unrealized gains (losses) recognized in AOCI     (78) (12)
Carrying value     43 48
Gross unrecognized gains     3 6
Gross unrecognized losses     (1) (1)
Fair value     45 53
Mortgage-backed securities - Alt-A        
Debt Securities Held-to-maturity        
Amortized cost     433 1,125
Net unrealized gains (losses) recognized in AOCI     (1) (213)
Carrying value     432 912
Gross unrecognized gains     259 537
Gross unrecognized losses     (162) (287)
Fair value     529 1,162
Mortgage-backed securities - Subprime        
Debt Securities Held-to-maturity        
Amortized cost     2 6
Net unrealized gains (losses) recognized in AOCI     0 (1)
Carrying value     2 5
Gross unrecognized gains     13 15
Gross unrecognized losses     0 0
Fair value     15 20
Mortgage-backed securities - Non-U.S. residential        
Debt Securities Held-to-maturity        
Amortized cost     1,330 983
Net unrealized gains (losses) recognized in AOCI     (60) (137)
Carrying value     1,270 846
Gross unrecognized gains     37 92
Gross unrecognized losses     0 0
Fair value     1,307 938
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     19,534 10,977
Net unrealized gains (losses) recognized in AOCI     (1) (268)
Carrying value     19,533 10,709
Gross unrecognized gains     383 757
Gross unrecognized losses     (263) (294)
Fair value     19,653 11,172
State and municipal securities        
Debt Securities Held-to-maturity        
Amortized cost     8,581 8,443
Net unrealized gains (losses) recognized in AOCI     (438) (494)
Carrying value     8,143 7,949
Gross unrecognized gains     245 227
Gross unrecognized losses     (87) (57)
Fair value     8,301 8,119
Fair value of securities transferred from AFS to HTM $ 100 $ 6,400    
Foreign government        
Debt Securities Held-to-maturity        
Amortized cost     4,068 4,725
Net unrealized gains (losses) recognized in AOCI     0 0
Carrying value     4,068 4,725
Gross unrecognized gains     28 77
Gross unrecognized losses     (3) 0
Fair value     4,093 4,802
Asset-backed securities        
Debt Securities Held-to-maturity        
Amortized cost     4,485 556
Net unrealized gains (losses) recognized in AOCI     (14) (18)
Carrying value     4,471 538
Gross unrecognized gains     34 50
Gross unrecognized losses     (41) (10)
Fair value     $ 4,464 $ 578