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INVESTMENTS - Overview (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Investment Holdings      
Investments $ 345,833   $ 353,304
Interest and dividends on investments      
Taxable interest 1,760 $ 1,677  
Interest exempt from U.S. federal income tax 146 143  
Dividend income 54 35  
Total interest and dividend income 1,960 1,855  
Gross realized investments losses, excluding losses from other-than-temporary impairment      
Gross realized investment gains 288 379  
Gross realized investment losses (96) (193)  
Net realized gains on sale of investments 192 $ 186  
Securities available-for-sale      
Amortized cost 290,759   300,269
Gross unrealized gains 1,774   1,721
Gross unrealized losses 2,251   2,566
Fair value 290,282   299,424
Mortgage-backed securities - U.S. agency-sponsored      
Securities available-for-sale      
Amortized cost 35,951   38,663
Gross unrealized gains 241   248
Gross unrealized losses 489   506
Fair value 35,703   38,405
Mortgage-backed securities - Prime      
Securities available-for-sale      
Amortized cost 2   2
Gross unrealized gains 0   0
Gross unrealized losses 0   0
Fair value 2   2
Mortgage-backed securities - Alt-A      
Securities available-for-sale      
Amortized cost 38   43
Gross unrealized gains 9   7
Gross unrealized losses 0   0
Fair value 47   50
Mortgage-backed securities - Non-U.S. residential      
Securities available-for-sale      
Amortized cost 3,416   3,852
Gross unrealized gains 31   13
Gross unrealized losses 22   7
Fair value 3,425   3,858
Mortgage-backed securities - Commercial      
Securities available-for-sale      
Amortized cost 360   357
Gross unrealized gains 1   2
Gross unrealized losses 1   1
Fair value 360   358
Mortgage-backed securities      
Securities available-for-sale      
Amortized cost 39,767   42,917
Gross unrealized gains 282   270
Gross unrealized losses 512   514
Fair value 39,537   42,673
U.S. Treasury      
Securities available-for-sale      
Amortized cost 107,543   113,606
Gross unrealized gains 637   629
Gross unrealized losses 396   452
Fair value 107,784   113,783
Agency obligations      
Securities available-for-sale      
Amortized cost 9,910   9,952
Gross unrealized gains 23   21
Gross unrealized losses 70   85
Fair value 9,863   9,888
U.S. Treasury and federal agency securities      
Securities available-for-sale      
Amortized cost 117,453   123,558
Gross unrealized gains 660   650
Gross unrealized losses 466   537
Fair value 117,647   123,671
State and municipal securities      
Securities available-for-sale      
Amortized cost 10,228   10,797
Gross unrealized gains 81   80
Gross unrealized losses 684   757
Fair value 9,625   10,120
Foreign government      
Securities available-for-sale      
Amortized cost 99,974   98,112
Gross unrealized gains 623   590
Gross unrealized losses 467   554
Fair value 100,130   98,148
Corporate      
Securities available-for-sale      
Amortized cost 15,897   17,195
Gross unrealized gains 91   105
Gross unrealized losses 109   176
Fair value 15,879   17,124
Asset-backed securities      
Securities available-for-sale      
Amortized cost 6,522   6,810
Gross unrealized gains 9   6
Gross unrealized losses 8   22
Fair value 6,523   6,794
Other debt securities      
Securities available-for-sale      
Amortized cost 550   503
Gross unrealized gains 0   0
Gross unrealized losses 0   0
Fair value 550   503
Debt securities      
Securities available-for-sale      
Amortized cost 290,391   299,892
Gross unrealized gains 1,746   1,701
Gross unrealized losses 2,246   2,560
Fair value 289,891   299,033
Equity securities      
Securities available-for-sale      
Amortized cost 368   377
Gross unrealized gains 28   20
Gross unrealized losses 5   6
Fair value 391   391
Securities available-for-sale (AFS)      
Investment Holdings      
Investments 290,282   299,424
Held-to-maturity securities      
Investment Holdings      
Investments 47,942   45,667
Non-marketable equity securities | Fair value      
Investment Holdings      
Investments 1,529   1,774
Non-marketable equity securities | Carried at cost      
Investment Holdings      
Investments $ 6,080   $ 6,439