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INVESTMENTS - Overview (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Investment Holdings          
Investments $ 345,513   $ 345,513   $ 352,290
Interest and dividends on investments          
Taxable interest 2,195 $ 1,922 6,395 $ 5,545  
Interest exempt from U.S. federal income tax 130 129 392 412  
Dividend income 63 53 209 165  
Total interest and dividend income 2,388 2,104 6,996 6,122  
Gross realized investments losses, excluding losses from other-than-temporary impairment          
Gross realized investment gains 153 293 550 840  
Gross realized investment losses (84) (80) (209) (214)  
Net realized gains on sale of investments 69 $ 213 341 $ 626  
Securities AFS          
Amortized cost 289,188   289,188   292,220
Gross unrealized gains 502   502    
Gross unrealized losses 4,908   4,908    
Fair value 284,782   284,782   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 46,675   46,675    
Gross unrealized gains 61   61    
Gross unrealized losses 1,575   1,575    
Fair value 45,161   45,161    
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 1,620   1,620    
Gross unrealized gains 7   7    
Gross unrealized losses 1   1    
Fair value 1,626   1,626    
Amortized cost         2,744
Gross unrealized gains         13
Gross unrealized losses         6
Fair value         2,751
Mortgage-backed securities - Commercial          
Securities AFS          
Amortized cost 233   233    
Gross unrealized gains 1   1    
Gross unrealized losses 3   3    
Fair value 231   231    
Amortized cost         334
Gross unrealized gains         0
Gross unrealized losses         2
Fair value         332
Mortgage-backed securities          
Securities AFS          
Amortized cost 48,529   48,529   45,231
Gross unrealized gains 69   69    
Gross unrealized losses 1,579   1,579    
Fair value 47,019   47,019   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 108,509   108,509    
Gross unrealized gains 28   28    
Gross unrealized losses 1,949   1,949    
Fair value 106,588   106,588    
Amortized cost         108,344
Gross unrealized gains         77
Gross unrealized losses         971
Fair value         107,450
Agency obligations          
Securities AFS          
Amortized cost 9,752   9,752    
Gross unrealized gains 0   0    
Gross unrealized losses 197   197    
Fair value 9,555   9,555    
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 118,261   118,261   119,157
Gross unrealized gains 28   28    
Gross unrealized losses 2,146   2,146    
Fair value 116,143   116,143   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 9,662   9,662   8,870
Gross unrealized gains 87   87    
Gross unrealized losses 269   269    
Fair value 9,480   9,480   8,765
Amortized cost         8,870
Gross unrealized gains         140
Gross unrealized losses         245
Fair value         8,765
Foreign government          
Securities AFS          
Amortized cost 94,937   94,937   100,615
Gross unrealized gains 293   293    
Gross unrealized losses 769   769    
Fair value 94,461   94,461   100,533
Amortized cost         100,615
Gross unrealized gains         508
Gross unrealized losses         590
Fair value         100,533
Corporate          
Securities AFS          
Amortized cost 12,498   12,498    
Gross unrealized gains 21   21    
Gross unrealized losses 139   139    
Fair value 12,380   12,380    
Amortized cost         14,144
Gross unrealized gains         51
Gross unrealized losses         86
Fair value         14,109
Asset-backed securities          
Securities AFS          
Amortized cost 1,265   1,265    
Gross unrealized gains 3   3    
Gross unrealized losses 6   6    
Fair value 1,262   1,262    
Amortized cost         3,906
Gross unrealized gains         14
Gross unrealized losses         2
Fair value         3,918
Other debt securities          
Securities AFS          
Amortized cost 4,036   4,036    
Gross unrealized gains 1   1    
Gross unrealized losses 0   0    
Fair value 4,037   4,037    
Amortized cost         297
Gross unrealized gains         0
Gross unrealized losses         0
Fair value         297
Debt securities          
Securities AFS          
Amortized cost 289,188   289,188    
Gross unrealized gains 502   502    
Gross unrealized losses 4,908   4,908    
Fair value 284,782   284,782    
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 284,782   284,782   290,914
Held-to-maturity securities          
Investment Holdings          
Investments 53,249   53,249   53,320
Marketable equity securities | Fair value          
Investment Holdings          
Investments 260   260    
Non-marketable equity securities | Fair value          
Investment Holdings          
Investments 1,128   1,128   1,206
Non-marketable equity securities | Carried at cost          
Investment Holdings          
Investments 5,642   5,642   $ 6,850
Non-marketable securities, measured using measurement alternative          
Investment Holdings          
Investments $ 452   $ 452