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INVESTMENTS - Overview (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Investment Holdings          
Investments $ 349,716   $ 349,716   $ 352,290
Interest and dividends on investments          
Taxable interest 2,158 $ 1,859 4,200 $ 3,623  
Interest exempt from U.S. federal income tax 132 141 262 283  
Dividend income 84 58 146 112  
Total interest and dividend income 2,374 2,058 4,608 4,018  
Gross realized investments losses, excluding losses from other-than-temporary impairment          
Gross realized investment gains 170 258 396 546  
Gross realized investment losses (68) (37) (124) (133)  
Net realized gains on sale of investments 102 $ 221 272 $ 413  
Securities AFS          
Amortized cost 292,340   292,340   292,220
Gross unrealized gains 760   760    
Gross unrealized losses 4,069   4,069    
Fair value 289,031   289,031   290,725
Amortized cost         292,406
Gross unrealized gains         1,035
Gross unrealized losses         2,527
Fair value         290,914
Mortgage-backed securities - U.S. agency-sponsored          
Securities AFS          
Amortized cost 43,825   43,825    
Gross unrealized gains 141   141    
Gross unrealized losses 994   994    
Fair value 42,972   42,972    
Amortized cost         42,116
Gross unrealized gains         125
Gross unrealized losses         500
Fair value         41,741
Mortgage-backed securities - Prime          
Securities AFS          
Amortized cost 0   0    
Gross unrealized gains 0   0    
Gross unrealized losses 0   0    
Fair value 0   0    
Amortized cost         11
Gross unrealized gains         6
Gross unrealized losses         0
Fair value         17
Mortgage-backed securities - Alt-A          
Securities AFS          
Amortized cost 1   1    
Gross unrealized gains 0   0    
Gross unrealized losses 0   0    
Fair value 1   1    
Amortized cost         26
Gross unrealized gains         90
Gross unrealized losses         0
Fair value         116
Mortgage-backed securities - Non-U.S. residential          
Securities AFS          
Amortized cost 1,851   1,851    
Gross unrealized gains 7   7    
Gross unrealized losses 1   1    
Fair value 1,857   1,857    
Amortized cost         2,744
Gross unrealized gains         13
Gross unrealized losses         6
Fair value         2,751
Mortgage-backed securities - Commercial          
Securities AFS          
Amortized cost 281   281    
Gross unrealized gains 1   1    
Gross unrealized losses 3   3    
Fair value 279   279    
Amortized cost         334
Gross unrealized gains         0
Gross unrealized losses         2
Fair value         332
Mortgage-backed securities          
Securities AFS          
Amortized cost 45,958   45,958   45,231
Gross unrealized gains 149   149    
Gross unrealized losses 998   998    
Fair value 45,109   45,109   44,957
Amortized cost         45,231
Gross unrealized gains         234
Gross unrealized losses         508
Fair value         44,957
U.S. Treasury          
Securities AFS          
Amortized cost 108,616   108,616    
Gross unrealized gains 53   53    
Gross unrealized losses 1,772   1,772    
Fair value 106,897   106,897    
Amortized cost         108,344
Gross unrealized gains         77
Gross unrealized losses         971
Fair value         107,450
Agency obligations          
Securities AFS          
Amortized cost 11,557   11,557    
Gross unrealized gains 7   7    
Gross unrealized losses 190   190    
Fair value 11,374   11,374    
Amortized cost         10,813
Gross unrealized gains         7
Gross unrealized losses         124
Fair value         10,696
U.S. Treasury and federal agency securities          
Securities AFS          
Amortized cost 120,173   120,173   119,157
Gross unrealized gains 60   60    
Gross unrealized losses 1,962   1,962    
Fair value 118,271   118,271   118,146
Amortized cost         119,157
Gross unrealized gains         84
Gross unrealized losses         1,095
Fair value         118,146
State and municipal securities          
Securities AFS          
Amortized cost 9,885   9,885   8,870
Gross unrealized gains 123   123    
Gross unrealized losses 244   244    
Fair value 9,764   9,764   8,765
Amortized cost         8,870
Gross unrealized gains         140
Gross unrealized losses         245
Fair value         8,765
Foreign government          
Securities AFS          
Amortized cost 98,172   98,172   100,615
Gross unrealized gains 385   385    
Gross unrealized losses 732   732    
Fair value 97,825   97,825   100,533
Amortized cost         100,615
Gross unrealized gains         508
Gross unrealized losses         590
Fair value         100,533
Corporate          
Securities AFS          
Amortized cost 12,694   12,694    
Gross unrealized gains 37   37    
Gross unrealized losses 130   130    
Fair value 12,601   12,601    
Amortized cost         14,144
Gross unrealized gains         51
Gross unrealized losses         86
Fair value         14,109
Asset-backed securities          
Securities AFS          
Amortized cost 1,868   1,868    
Gross unrealized gains 5   5    
Gross unrealized losses 3   3    
Fair value 1,870   1,870    
Amortized cost         3,906
Gross unrealized gains         14
Gross unrealized losses         2
Fair value         3,918
Other debt securities          
Securities AFS          
Amortized cost 3,590   3,590    
Gross unrealized gains 1   1    
Gross unrealized losses 0   0    
Fair value 3,591   3,591    
Amortized cost         297
Gross unrealized gains         0
Gross unrealized losses         0
Fair value         297
Debt securities          
Securities AFS          
Amortized cost 292,340   292,340    
Gross unrealized gains 760   760    
Gross unrealized losses 4,069   4,069    
Fair value 289,031   289,031    
Amortized cost         292,220
Gross unrealized gains         1,031
Gross unrealized losses         2,526
Fair value         290,725
Equity securities          
Securities AFS          
Amortized cost         186
Gross unrealized gains         4
Gross unrealized losses         1
Fair value         189
Securities available-for-sale (AFS)          
Investment Holdings          
Investments 289,031   289,031   290,914
Held-to-maturity securities          
Investment Holdings          
Investments 52,897   52,897   53,320
Marketable equity securities | Fair value          
Investment Holdings          
Investments 204   204    
Non-marketable equity securities | Fair value          
Investment Holdings          
Investments 1,228   1,228   1,206
Non-marketable equity securities | Carried at cost          
Investment Holdings          
Investments 5,941   5,941   $ 6,850
Non-marketable securities, measured using measurement alternative          
Investment Holdings          
Investments $ 415   $ 415