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INVESTMENTS - Overview (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Investment Holdings          
Investments $ 358,383   $ 358,383   $ 358,607
Interest and dividends on investments          
Taxable interest 2,291 $ 2,195 6,987 $ 6,395  
Interest exempt from U.S. federal income tax 75 130 328 392  
Dividend income 45 63 149 209  
Total interest and dividend income 2,411 2,388 7,464 6,996  
Gross realized investments losses, excluding losses from other-than-temporary impairment          
Gross realized investment gains 393 153 1,036 550  
Gross realized investment losses (32) (84) (77) (209)  
Net realized gains on sale of investments 361 $ 69 959 $ 341  
Debt securities AFS          
Fair value 275,425   275,425   288,038
Debt securities available-for-sale (AFS)          
Investment Holdings          
Investments 275,425   275,425   288,038
Debt securities held-to-maturity securities (HTM)          
Investment Holdings          
Investments 75,841   75,841   63,357
Marketable equity securities | Fair value          
Investment Holdings          
Investments 510   510   220
Non-marketable equity securities | Fair value          
Investment Holdings          
Investments 627   627   889
Non-marketable equity securities | Carried at cost          
Investment Holdings          
Investments 5,292   5,292   5,565
Non-marketable securities, measured using measurement alternative          
Investment Holdings          
Investments 688   688   538
Mortgage-backed securities - U.S. agency-sponsored          
Debt securities AFS          
Amortized cost 38,735   38,735   43,504
Gross unrealized gains 777   777   241
Gross unrealized losses 311   311   725
Fair value 39,201   39,201   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 789   789   1,310
Gross unrealized gains 3   3   4
Gross unrealized losses 0   0   2
Fair value 792   792   1,312
Commercial and other          
Debt securities AFS          
Amortized cost 84   84   173
Gross unrealized gains 1   1   1
Gross unrealized losses 0   0   2
Fair value 85   85   172
Mortgage-backed securities          
Debt securities AFS          
Amortized cost 39,609   39,609   44,988
Gross unrealized gains 781   781   246
Gross unrealized losses 311   311   729
Fair value 40,079   40,079   44,505
U.S. Treasury          
Debt securities AFS          
Amortized cost 102,384   102,384   109,376
Gross unrealized gains 56   56   33
Gross unrealized losses 474   474   1,339
Fair value 101,966   101,966   108,070
Agency obligations          
Debt securities AFS          
Amortized cost 6,293   6,293   9,283
Gross unrealized gains 5   5   1
Gross unrealized losses 31   31   132
Fair value 6,267   6,267   9,152
U.S. Treasury and federal agency securities          
Debt securities AFS          
Amortized cost 108,677   108,677   118,659
Gross unrealized gains 61   61   34
Gross unrealized losses 505   505   1,471
Fair value 108,233   108,233   117,222
State and municipal securities          
Debt securities AFS          
Amortized cost 5,997   5,997   9,372
Gross unrealized gains 149   149   96
Gross unrealized losses 192   192   262
Fair value 5,954   5,954   9,206
Foreign government          
Debt securities AFS          
Amortized cost 105,041   105,041   100,872
Gross unrealized gains 716   716   415
Gross unrealized losses 228   228   596
Fair value 105,529   105,529   100,691
Corporate          
Debt securities AFS          
Amortized cost 11,207   11,207   11,714
Gross unrealized gains 86   86   42
Gross unrealized losses 110   110   157
Fair value 11,183   11,183   11,599
Asset-backed securities          
Debt securities AFS          
Amortized cost 541   541   845
Gross unrealized gains 2   2   2
Gross unrealized losses 2   2   4
Fair value 541   541   843
Other debt securities          
Debt securities AFS          
Amortized cost 3,906   3,906   3,973
Gross unrealized gains 1   1   0
Gross unrealized losses 1   1   1
Fair value 3,906   3,906   3,972
Debt securities AFS          
Debt securities AFS          
Amortized cost 274,978   274,978   290,423
Gross unrealized gains 1,796   1,796   835
Gross unrealized losses 1,349   1,349   3,220
Fair value $ 275,425   $ 275,425   $ 288,038