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INVESTMENTS - Debt Securities Held-to-Maturity (Details) - USD ($)
$ in Millions
 3 Months Ended
Dec. 31, 2016
Sep. 30, 2017
Debt Securities Held-to-maturity    
Amortized cost basis $ 46,163 $ 51,594
Net unrealized gains (losses) recognized in AOCI (496) (67)
Carrying value 45,667 51,527
Gross unrealized gains 345 695
Gross unrealized (losses) (457) (192)
Fair value 45,555 52,030
Fair value of AFS securities transferred to HTM 5,800  
Mortgage-backed securities - U.S. agency-sponsored    
Debt Securities Held-to-maturity    
Amortized cost basis 22,462 23,683
Net unrealized gains (losses) recognized in AOCI 33 26
Carrying value 22,495 23,709
Gross unrealized gains 47 104
Gross unrealized (losses) (186) (78)
Fair value 22,356 23,735
Fair value of AFS securities transferred to HTM 5,000  
Mortgage-backed securities - Prime    
Debt Securities Held-to-maturity    
Amortized cost basis 31 13
Net unrealized gains (losses) recognized in AOCI (7) 0
Carrying value 24 13
Gross unrealized gains 10 4
Gross unrealized (losses) (1) 0
Fair value 33 17
Mortgage-backed securities - Alt-A    
Debt Securities Held-to-maturity    
Amortized cost basis 314 256
Net unrealized gains (losses) recognized in AOCI (27) (11)
Carrying value 287 245
Gross unrealized gains 69 97
Gross unrealized (losses) (1) 0
Fair value 355 342
Mortgage-backed securities - Non-U.S. residential    
Debt Securities Held-to-maturity    
Amortized cost basis 1,871 1,932
Net unrealized gains (losses) recognized in AOCI (47) (47)
Carrying value 1,824 1,885
Gross unrealized gains 49 58
Gross unrealized (losses) 0 0
Fair value 1,873 1,943
Mortgage-backed securities - Commercial    
Debt Securities Held-to-maturity    
Amortized cost basis 14 217
Net unrealized gains (losses) recognized in AOCI 0 0
Carrying value 14 217
Gross unrealized gains 0 0
Gross unrealized (losses) 0 0
Fair value 14 217
Mortgage-backed securities    
Debt Securities Held-to-maturity    
Amortized cost basis 24,692 26,101
Net unrealized gains (losses) recognized in AOCI (48) (32)
Carrying value 24,644 26,069
Gross unrealized gains 175 263
Gross unrealized (losses) (188) (78)
Fair value 24,631 26,254
State and municipal securities    
Debt Securities Held-to-maturity    
Amortized cost basis 9,025 8,588
Net unrealized gains (losses) recognized in AOCI (442) (30)
Carrying value 8,583 8,558
Gross unrealized gains 129 338
Gross unrealized (losses) (238) (90)
Fair value 8,474 8,806
Fair value of AFS securities transferred to HTM 830  
Foreign government    
Debt Securities Held-to-maturity    
Amortized cost basis 1,339 584
Net unrealized gains (losses) recognized in AOCI 0 0
Carrying value 1,339 584
Gross unrealized gains 0 0
Gross unrealized (losses) (26) (14)
Fair value 1,313 570
Asset-backed securities    
Debt Securities Held-to-maturity    
Amortized cost basis 11,107 16,286
Net unrealized gains (losses) recognized in AOCI (6) (5)
Carrying value 11,101 16,281
Gross unrealized gains 41 94
Gross unrealized (losses) (5) (10)
Fair value $ 11,137 16,365
Other debt securities    
Debt Securities Held-to-maturity    
Amortized cost basis   35
Net unrealized gains (losses) recognized in AOCI   0
Carrying value   35
Gross unrealized gains   0
Gross unrealized (losses)   0
Fair value   $ 35