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INVESTMENTS - Overview (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Investment Holdings          
Investments $ 354,940   $ 354,940   $ 342,955
Interest and dividends on investments          
Taxable interest 1,741 $ 1,596 5,219 $ 4,773  
Interest exempt from U.S. federal income tax 111 44 345 116  
Dividend income 35 87 115 305  
Total interest and dividend income 1,887 1,727 5,679 5,194  
Gross realized investments losses, excluding losses from other-than-temporary impairment          
Gross realized investment gains 483 213 1,105 926  
Gross realized investment losses (196) (62) (432) (285)  
Net realized gains on sale of investments 287 $ 151 673 $ 641  
Securities available-for-sale          
Amortized cost 305,232   305,232   300,202
Gross unrealized gains 4,086   4,086   1,375
Gross unrealized losses 1,201   1,201   2,441
Fair value 308,117   308,117   299,136
Mortgage-backed securities - U.S. agency-sponsored          
Securities available-for-sale          
Amortized cost 42,465   42,465   39,584
Gross unrealized gains 808   808   367
Gross unrealized losses 71   71   237
Fair value 43,202   43,202   39,714
Mortgage-backed securities - Prime          
Securities available-for-sale          
Amortized cost 5   5   2
Gross unrealized gains 0   0   0
Gross unrealized losses 0   0   0
Fair value 5   5   2
Mortgage-backed securities - Alt-A          
Securities available-for-sale          
Amortized cost 45   45   50
Gross unrealized gains 5   5   5
Gross unrealized losses 0   0   0
Fair value 50   50   55
Mortgage-backed securities - Non-U.S. residential          
Securities available-for-sale          
Amortized cost 4,437   4,437   5,909
Gross unrealized gains 19   19   31
Gross unrealized losses 10   10   11
Fair value 4,446   4,446   5,929
Mortgage-backed securities - Commercial          
Securities available-for-sale          
Amortized cost 351   351   573
Gross unrealized gains 4   4   2
Gross unrealized losses 1   1   4
Fair value 354   354   571
Mortgage-backed securities          
Securities available-for-sale          
Amortized cost 47,303   47,303   46,118
Gross unrealized gains 836   836   405
Gross unrealized losses 82   82   252
Fair value 48,057   48,057   46,271
U.S. Treasury          
Securities available-for-sale          
Amortized cost 108,857   108,857   113,096
Gross unrealized gains 1,979   1,979   254
Gross unrealized losses 33   33   515
Fair value 110,803   110,803   112,835
Agency obligations          
Securities available-for-sale          
Amortized cost 10,801   10,801   10,095
Gross unrealized gains 108   108   22
Gross unrealized losses 6   6   37
Fair value 10,903   10,903   10,080
U.S. Treasury and federal agency          
Securities available-for-sale          
Amortized cost 119,658   119,658   123,191
Gross unrealized gains 2,087   2,087   276
Gross unrealized losses 39   39   552
Fair value 121,706   121,706   122,915
State and municipal securities          
Securities available-for-sale          
Amortized cost 11,703   11,703   12,099
Gross unrealized gains 201   201   132
Gross unrealized losses 713   713   772
Fair value 11,191   11,191   11,459
Foreign government          
Securities available-for-sale          
Amortized cost 97,633   97,633   88,751
Gross unrealized gains 708   708   402
Gross unrealized losses 201   201   479
Fair value 98,140   98,140   88,674
Corporate          
Securities available-for-sale          
Amortized cost 18,982   18,982   19,492
Gross unrealized gains 230   230   129
Gross unrealized losses 132   132   291
Fair value 19,080   19,080   19,330
Asset-backed securities          
Securities available-for-sale          
Amortized cost 7,452   7,452   9,261
Gross unrealized gains 6   6   5
Gross unrealized losses 32   32   92
Fair value 7,426   7,426   9,174
Other          
Securities available-for-sale          
Amortized cost 1,192   1,192   688
Gross unrealized gains 0   0   0
Gross unrealized losses 0   0   0
Fair value 1,192   1,192   688
Debt securities          
Securities available-for-sale          
Amortized cost 303,923   303,923   299,600
Gross unrealized gains 4,068   4,068   1,349
Gross unrealized losses 1,199   1,199   2,438
Fair value 306,792   306,792   298,511
Equity securities          
Securities available-for-sale          
Amortized cost 1,309   1,309   602
Gross unrealized gains 18   18   26
Gross unrealized losses 2   2   3
Fair value 1,325   1,325   625
Securities available-for-sale (AFS)          
Investment Holdings          
Investments 308,117   308,117   299,136
Held-to-maturity Securities          
Investment Holdings          
Investments 38,588   38,588   36,215
Non-marketable equity securities | Fair value          
Investment Holdings          
Investments 1,977   1,977   2,088
Non-marketable equity securities | Carried at cost          
Investment Holdings          
Investments $ 6,258   $ 6,258   $ 5,516