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INVESTMENTS - Debt Securities Held-to-Maturity (Details) - USD ($)
$ in Millions
 3 Months Ended
Dec. 31, 2016
Mar. 31, 2017
Debt Securities Held-to-maturity    
Amortized cost basis $ 46,163 $ 48,459
Net unrealized gains (losses) recognized in AOCI (496) (517)
Carrying value 45,667 47,942
Gross unrealized gains 345 420
Gross unrealized (losses) (457) (455)
Fair value 45,555 47,907
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 23,998
Net unrealized gains (losses) recognized in AOCI 33 27
Carrying value 22,495 24,025
Gross unrealized gains 47 46
Gross unrealized (losses) (186) (204)
Fair value 22,356 23,867
Fair value of AFS securities transferred to HTM 5,000  
Mortgage-backed securities - Prime    
Debt Securities Held-to-maturity    
Amortized cost basis 31 7
Net unrealized gains (losses) recognized in AOCI (7) 0
Carrying value 24 7
Gross unrealized gains 10 10
Gross unrealized (losses) (1) 0
Fair value 33 17
Mortgage-backed securities - Alt-A    
Debt Securities Held-to-maturity    
Amortized cost basis 314 303
Net unrealized gains (losses) recognized in AOCI (27) (25)
Carrying value 287 278
Gross unrealized gains 69 78
Gross unrealized (losses) (1) 0
Fair value 355 356
Mortgage-backed securities - Non-U.S. residential    
Debt Securities Held-to-maturity    
Amortized cost basis 1,871 1,828
Net unrealized gains (losses) recognized in AOCI (47) (46)
Carrying value 1,824 1,782
Gross unrealized gains 49 60
Gross unrealized (losses) 0 0
Fair value 1,873 1,842
Mortgage-backed securities - Commercial    
Debt Securities Held-to-maturity    
Amortized cost basis 14 26
Net unrealized gains (losses) recognized in AOCI 0 0
Carrying value 14 26
Gross unrealized gains 0 0
Gross unrealized (losses) 0 0
Fair value 14 26
Mortgage-backed securities    
Debt Securities Held-to-maturity    
Amortized cost basis 24,692 26,162
Net unrealized gains (losses) recognized in AOCI (48) (44)
Carrying value 24,644 26,118
Gross unrealized gains 175 194
Gross unrealized (losses) (188) (204)
Fair value 24,631 26,108
State and municipal securities    
Debt Securities Held-to-maturity    
Amortized cost basis 9,025 9,530
Net unrealized gains (losses) recognized in AOCI (442) (468)
Carrying value 8,583 9,062
Gross unrealized gains 129 163
Gross unrealized (losses) (238) (224)
Fair value 8,474 9,001
Fair value of AFS securities transferred to HTM 830  
Foreign government    
Debt Securities Held-to-maturity    
Amortized cost basis 1,339 1,202
Net unrealized gains (losses) recognized in AOCI 0 0
Carrying value 1,339 1,202
Gross unrealized gains 0 0
Gross unrealized (losses) (26) (21)
Fair value 1,313 1,181
Asset-backed securities    
Debt Securities Held-to-maturity    
Amortized cost basis 11,107 11,565
Net unrealized gains (losses) recognized in AOCI (6) (5)
Carrying value 11,101 11,560
Gross unrealized gains 41 63
Gross unrealized (losses) (5) (6)
Fair value $ 11,137 $ 11,617