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INVESTMENTS - Overview (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Investment Holdings          
Investments $ 351,710   $ 351,710   $ 353,304
Interest and dividends on investments          
Taxable interest 1,859 $ 1,759 3,623 $ 3,436  
Interest exempt from U.S. federal income tax 141 133 283 276  
Dividend income 58 45 112 80  
Total interest and dividend income 2,058 1,937 4,018 3,792  
Gross realized investments losses, excluding losses from other-than-temporary impairment          
Gross realized investment gains 258 244 546 623  
Gross realized investment losses (37) (44) (133) (237)  
Net realized gains on sale of investments 221 $ 200 413 $ 386  
Securities available-for-sale          
Amortized cost 293,788   293,788   300,269
Gross unrealized gains 1,483   1,483   1,721
Gross unrealized losses 1,642   1,642   2,566
Fair value 293,629   293,629   299,424
Mortgage-backed securities - U.S. agency-sponsored          
Securities available-for-sale          
Amortized cost 43,351   43,351   38,663
Gross unrealized gains 246   246   248
Gross unrealized losses 399   399   506
Fair value 43,198   43,198   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 3,154   3,154   3,852
Gross unrealized gains 14   14   13
Gross unrealized losses 5   5   7
Fair value 3,163   3,163   3,858
Mortgage-backed securities - Commercial          
Securities available-for-sale          
Amortized cost 357   357   357
Gross unrealized gains 1   1   2
Gross unrealized losses 1   1   1
Fair value 357   357   358
Mortgage-backed securities          
Securities available-for-sale          
Amortized cost 46,863   46,863   42,917
Gross unrealized gains 261   261   270
Gross unrealized losses 405   405   514
Fair value 46,719   46,719   42,673
U.S. Treasury          
Securities available-for-sale          
Amortized cost 102,340   102,340   113,606
Gross unrealized gains 414   414   629
Gross unrealized losses 359   359   452
Fair value 102,395   102,395   113,783
Agency obligations          
Securities available-for-sale          
Amortized cost 10,240   10,240   9,952
Gross unrealized gains 24   24   21
Gross unrealized losses 61   61   85
Fair value 10,203   10,203   9,888
U.S. Treasury and federal agency securities          
Securities available-for-sale          
Amortized cost 112,580   112,580   123,558
Gross unrealized gains 438   438   650
Gross unrealized losses 420   420   537
Fair value 112,598   112,598   123,671
State and municipal securities          
Securities available-for-sale          
Amortized cost 9,700   9,700   10,797
Gross unrealized gains 142   142   80
Gross unrealized losses 303   303   757
Fair value 9,539   9,539   10,120
Foreign government          
Securities available-for-sale          
Amortized cost 101,669   101,669   98,112
Gross unrealized gains 514   514   590
Gross unrealized losses 401   401   554
Fair value 101,782   101,782   98,148
Corporate          
Securities available-for-sale          
Amortized cost 16,111   16,111   17,195
Gross unrealized gains 93   93   105
Gross unrealized losses 101   101   176
Fair value 16,103   16,103   17,124
Asset-backed securities          
Securities available-for-sale          
Amortized cost 6,020   6,020   6,810
Gross unrealized gains 10   10   6
Gross unrealized losses 6   6   22
Fair value 6,024   6,024   6,794
Other debt securities          
Securities available-for-sale          
Amortized cost 431   431   503
Gross unrealized gains 0   0   0
Gross unrealized losses 0   0   0
Fair value 431   431   503
Debt securities          
Securities available-for-sale          
Amortized cost 293,374   293,374   299,892
Gross unrealized gains 1,458   1,458   1,701
Gross unrealized losses 1,636   1,636   2,560
Fair value 293,196   293,196   299,033
Equity securities          
Securities available-for-sale          
Amortized cost 414   414   377
Gross unrealized gains 25   25   20
Gross unrealized losses 6   6   6
Fair value 433   433   391
Securities available-for-sale (AFS)          
Investment Holdings          
Investments 293,629   293,629   299,424
Held-to-maturity securities          
Investment Holdings          
Investments 50,175   50,175   45,667
Non-marketable equity securities | Fair value          
Investment Holdings          
Investments 1,384   1,384   1,774
Non-marketable equity securities | Carried at cost          
Investment Holdings          
Investments $ 6,522   $ 6,522   $ 6,439