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INVESTMENTS - Overview (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Investment Holdings          
Investments $ 354,674   $ 354,674   $ 353,304
Interest and dividends on investments          
Taxable interest 1,922 $ 1,717 5,545 $ 5,153  
Interest exempt from U.S. federal income tax 129 135 412 411  
Dividend income 53 35 165 115  
Total interest and dividend income 2,104 1,887 6,122 5,679  
Gross realized investments losses, excluding losses from other-than-temporary impairment          
Gross realized investment gains 293 483 840 1,105  
Gross realized investment losses (80) (196) (214) (432)  
Net realized gains on sale of investments 213 $ 287 626 $ 673  
Securities available-for-sale          
Amortized cost 295,581   295,581   300,269
Gross unrealized gains 1,332   1,332   1,721
Gross unrealized losses 1,598   1,598   2,566
Fair value 295,315   295,315   299,424
Mortgage-backed securities - U.S. agency-sponsored          
Securities available-for-sale          
Amortized cost 42,422   42,422   38,663
Gross unrealized gains 223   223   248
Gross unrealized losses 331   331   506
Fair value 42,314   42,314   38,405
Mortgage-backed securities - Prime          
Securities available-for-sale          
Amortized cost 1   1   2
Gross unrealized gains 0   0   0
Gross unrealized losses 0   0   0
Fair value 1   1   2
Mortgage-backed securities - Alt-A          
Securities available-for-sale          
Amortized cost 0   0   43
Gross unrealized gains 0   0   7
Gross unrealized losses 0   0   0
Fair value 0   0   50
Mortgage-backed securities - Non-U.S. residential          
Securities available-for-sale          
Amortized cost 2,984   2,984   3,852
Gross unrealized gains 16   16   13
Gross unrealized losses 9   9   7
Fair value 2,991   2,991   3,858
Mortgage-backed securities - Commercial          
Securities available-for-sale          
Amortized cost 345   345   357
Gross unrealized gains 1   1   2
Gross unrealized losses 2   2   1
Fair value 344   344   358
Mortgage-backed securities          
Securities available-for-sale          
Amortized cost 45,752   45,752   42,917
Gross unrealized gains 240   240   270
Gross unrealized losses 342   342   514
Fair value 45,650   45,650   42,673
U.S. Treasury          
Securities available-for-sale          
Amortized cost 107,696   107,696   113,606
Gross unrealized gains 283   283   629
Gross unrealized losses 408   408   452
Fair value 107,571   107,571   113,783
Agency obligations          
Securities available-for-sale          
Amortized cost 10,803   10,803   9,952
Gross unrealized gains 17   17   21
Gross unrealized losses 65   65   85
Fair value 10,755   10,755   9,888
U.S. Treasury and federal agency securities          
Securities available-for-sale          
Amortized cost 118,499   118,499   123,558
Gross unrealized gains 300   300   650
Gross unrealized losses 473   473   537
Fair value 118,326   118,326   123,671
State and municipal securities          
Securities available-for-sale          
Amortized cost 9,335   9,335   10,797
Gross unrealized gains 146   146   80
Gross unrealized losses 291   291   757
Fair value 9,190   9,190   10,120
Foreign government          
Securities available-for-sale          
Amortized cost 100,625   100,625   98,112
Gross unrealized gains 526   526   590
Gross unrealized losses 404   404   554
Fair value 100,747   100,747   98,148
Corporate          
Securities available-for-sale          
Amortized cost 15,459   15,459   17,195
Gross unrealized gains 82   82   105
Gross unrealized losses 82   82   176
Fair value 15,459   15,459   17,124
Asset-backed securities          
Securities available-for-sale          
Amortized cost 5,279   5,279   6,810
Gross unrealized gains 15   15   6
Gross unrealized losses 3   3   22
Fair value 5,291   5,291   6,794
Other debt securities          
Securities available-for-sale          
Amortized cost 348   348   503
Gross unrealized gains 0   0   0
Gross unrealized losses 0   0   0
Fair value 348   348   503
Debt securities          
Securities available-for-sale          
Amortized cost 295,297   295,297   299,892
Gross unrealized gains 1,309   1,309   1,701
Gross unrealized losses 1,595   1,595   2,560
Fair value 295,011   295,011   299,033
Equity securities          
Securities available-for-sale          
Amortized cost 284   284   377
Gross unrealized gains 23   23   20
Gross unrealized losses 3   3   6
Fair value 304   304   391
Securities available-for-sale (AFS)          
Investment Holdings          
Investments 295,315   295,315   299,424
Held-to-maturity securities          
Investment Holdings          
Investments 51,527   51,527   45,667
Non-marketable equity securities | Fair value          
Investment Holdings          
Investments 1,300   1,300   1,774
Non-marketable equity securities | Carried at cost          
Investment Holdings          
Investments $ 6,532   $ 6,532   $ 6,439