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INVESTMENTS - Overview (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Investment Holdings          
Investments $ 349,702   $ 349,702   $ 358,607
Interest and dividends on investments          
Taxable interest 2,324 $ 2,158 4,696 $ 4,200  
Interest exempt from U.S. federal income tax 126 132 253 262  
Dividend income 55 84 104 146  
Total interest and dividend income 2,505 2,374 5,053 4,608  
Gross realized investments losses, excluding losses from other-than-temporary impairment          
Gross realized investment gains 474 170 642 396  
Gross realized investment losses (6) (68) (44) (124)  
Net realized gains on sale of investments 468 $ 102 598 $ 272  
Debt securities AFS          
Amortized cost 273,378   273,378   290,423
Fair value 273,435   273,435   288,038
Mortgage-backed securities - U.S. agency-sponsored          
Debt securities AFS          
Amortized cost 37,488   37,488   43,504
Gross unrealized gains 717   717   241
Gross unrealized losses 345   345   725
Fair value 37,860   37,860   43,020
Mortgage-backed securities - Alt-A          
Debt securities AFS          
Amortized cost 1   1   1
Gross unrealized gains 0   0   0
Gross unrealized losses 0   0   0
Fair value 1   1   1
Mortgage-backed securities - Non-U.S. residential          
Debt securities AFS          
Amortized cost 907   907   1,310
Gross unrealized gains 3   3   4
Gross unrealized losses 1   1   2
Fair value 909   909   1,312
Commercial and other          
Debt securities AFS          
Amortized cost 114   114   173
Gross unrealized gains 1   1   1
Gross unrealized losses 0   0   2
Fair value 115   115   172
Mortgage-backed securities          
Debt securities AFS          
Amortized cost 38,510   38,510   44,988
Gross unrealized gains 721   721   246
Gross unrealized losses 346   346   729
Fair value 38,885   38,885   44,505
U.S. Treasury          
Debt securities AFS          
Amortized cost 102,563   102,563   109,376
Gross unrealized gains 82   82   33
Gross unrealized losses 583   583   1,339
Fair value 102,062   102,062   108,070
Agency obligations          
Debt securities AFS          
Amortized cost 7,488   7,488   9,283
Gross unrealized gains 7   7   1
Gross unrealized losses 48   48   132
Fair value 7,447   7,447   9,152
U.S. Treasury and federal agency securities          
Debt securities AFS          
Amortized cost 110,051   110,051   118,659
Gross unrealized gains 89   89   34
Gross unrealized losses 631   631   1,471
Fair value 109,509   109,509   117,222
State and municipal securities          
Debt securities AFS          
Amortized cost 6,228   6,228   9,372
Gross unrealized gains 139   139   96
Gross unrealized losses 197   197   262
Fair value 6,170   6,170   9,206
Foreign government          
Debt securities AFS          
Amortized cost 101,400   101,400   100,872
Gross unrealized gains 803   803   415
Gross unrealized losses 463   463   596
Fair value 101,740   101,740   100,691
Corporate          
Debt securities AFS          
Amortized cost 12,380   12,380   11,714
Gross unrealized gains 74   74   42
Gross unrealized losses 131   131   157
Fair value 12,323   12,323   11,599
Asset-backed securities          
Debt securities AFS          
Amortized cost 618   618   845
Gross unrealized gains 2   2   2
Gross unrealized losses 2   2   4
Fair value 618   618   843
Other debt securities          
Debt securities AFS          
Amortized cost 4,191   4,191   3,973
Gross unrealized gains 0   0   0
Gross unrealized losses 1   1   1
Fair value 4,190   4,190   3,972
Debt securities          
Debt securities AFS          
Amortized cost 273,378   273,378   290,423
Gross unrealized gains 1,828   1,828   835
Gross unrealized losses 1,771   1,771   3,220
Fair value 273,435   273,435   288,038
Debt securities available-for-sale (AFS)          
Investment Holdings          
Investments 273,435   273,435   288,038
Debt securities held-to-maturity securities (HTM)          
Investment Holdings          
Investments 68,693   68,693   63,357
Marketable equity securities | Fair value          
Investment Holdings          
Investments 533   533   220
Non-marketable equity securities | Fair value          
Investment Holdings          
Investments 740   740   889
Non-marketable equity securities | Carried at cost          
Investment Holdings          
Investments 5,659   5,659   5,565
Non-marketable securities, measured using measurement alternative          
Investment Holdings          
Investments $ 642   $ 642   $ 538