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INVESTMENTS - Debt Securities Held-to-Maturity (Details) - USD ($)
$ in Millions
 3 Months Ended
Dec. 31, 2016
Jun. 30, 2015
Dec. 31, 2015
Debt Securities Held-to-maturity      
Amortized cost $ 46,163   $ 36,668
Net unrealized gains (losses) recognized in AOCI (496)   (453)
Carrying value 45,667   36,215
Gross unrecognized gains 345   690
Gross unrecognized losses (457)   (394)
Fair value 45,555   36,511
Fair value of securities transferred from AFS to HTM 5,800 $ 7,100  
Mortgage-backed securities - U.S. agency-sponsored      
Debt Securities Held-to-maturity      
Amortized cost 22,462   17,648
Net unrealized gains (losses) recognized in AOCI 33   138
Carrying value 22,495   17,786
Gross unrecognized gains 47   71
Gross unrecognized losses (186)   (100)
Fair value 22,356   17,757
Fair value of securities transferred from AFS to HTM 5,000 7,000  
Mortgage-backed securities - Prime      
Debt Securities Held-to-maturity      
Amortized cost 31   121
Net unrealized gains (losses) recognized in AOCI (7)   (78)
Carrying value 24   43
Gross unrecognized gains 10   3
Gross unrecognized losses (1)   (1)
Fair value 33   45
Mortgage-backed securities - Alt-A      
Debt Securities Held-to-maturity      
Amortized cost 314   433
Net unrealized gains (losses) recognized in AOCI (27)   (1)
Carrying value 287   432
Gross unrecognized gains 69   259
Gross unrecognized losses (1)   (162)
Fair value 355   529
Mortgage-backed securities - Subprime      
Debt Securities Held-to-maturity      
Amortized cost 0   2
Net unrealized gains (losses) recognized in AOCI 0   0
Carrying value 0   2
Gross unrecognized gains 0   13
Gross unrecognized losses 0   0
Fair value 0   15
Mortgage-backed securities - Non-U.S. residential      
Debt Securities Held-to-maturity      
Amortized cost 1,871   1,330
Net unrealized gains (losses) recognized in AOCI (47)   (60)
Carrying value 1,824   1,270
Gross unrecognized gains 49   37
Gross unrecognized losses 0   0
Fair value 1,873   1,307
Mortgage-backed securities - Commercial      
Debt Securities Held-to-maturity      
Amortized cost 14   0
Net unrealized gains (losses) recognized in AOCI 0   0
Carrying value 14   0
Gross unrecognized gains 0   0
Gross unrecognized losses 0   0
Fair value 14   0
Mortgage-backed securities      
Debt Securities Held-to-maturity      
Amortized cost 24,692   19,534
Net unrealized gains (losses) recognized in AOCI (48)   (1)
Carrying value 24,644   19,533
Gross unrecognized gains 175   383
Gross unrecognized losses (188)   (263)
Fair value 24,631   19,653
State and municipal securities      
Debt Securities Held-to-maturity      
Amortized cost 9,025   8,581
Net unrealized gains (losses) recognized in AOCI (442)   (438)
Carrying value 8,583   8,143
Gross unrecognized gains 129   245
Gross unrecognized losses (238)   (87)
Fair value 8,474   8,301
Fair value of securities transferred from AFS to HTM 830 $ 100  
Foreign government      
Debt Securities Held-to-maturity      
Amortized cost 1,339   4,068
Net unrealized gains (losses) recognized in AOCI 0   0
Carrying value 1,339   4,068
Gross unrecognized gains 0   28
Gross unrecognized losses (26)   (3)
Fair value 1,313   4,093
Asset-backed securities      
Debt Securities Held-to-maturity      
Amortized cost 11,107   4,485
Net unrealized gains (losses) recognized in AOCI (6)   (14)
Carrying value 11,101   4,471
Gross unrecognized gains 41   34
Gross unrecognized losses (5)   (41)
Fair value $ 11,137   $ 4,464