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INVESTMENTS - Overview (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Investment Holdings      
Investments $ 351,971   $ 352,290
Interest and dividends on investments      
Taxable interest 2,042 $ 1,764  
Interest exempt from U.S. federal income tax 130 142  
Dividend income 62 54  
Total interest and dividend income 2,234 1,960  
Gross realized investments losses, excluding losses from other-than-temporary impairment      
Gross realized investment gains 345 288  
Gross realized investment losses (175) (96)  
Net realized gains on sale of investments 170 $ 192  
Securities AFS      
Amortized cost 294,262   292,220
Gross unrealized gains 1,077    
Gross unrealized losses 3,816    
Fair value 291,523   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 42,147    
Gross unrealized gains 134    
Gross unrealized losses 993    
Fair value 41,288    
Amortized cost     42,116
Gross unrealized gains     125
Gross unrealized losses     500
Fair value     41,741
Mortgage-backed securities - Prime      
Securities AFS      
Amortized cost 6    
Gross unrealized gains 3    
Gross unrealized losses 0    
Fair value 9    
Amortized cost     11
Gross unrealized gains     6
Gross unrealized losses     0
Fair value     17
Mortgage-backed securities - Alt-A      
Securities AFS      
Amortized cost 9    
Gross unrealized gains 88    
Gross unrealized losses 0    
Fair value 97    
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 2,645    
Gross unrealized gains 10    
Gross unrealized losses 2    
Fair value 2,653    
Amortized cost     2,744
Gross unrealized gains     13
Gross unrealized losses     6
Fair value     2,751
Mortgage-backed securities - Commercial      
Securities AFS      
Amortized cost 310    
Gross unrealized gains 1    
Gross unrealized losses 3    
Fair value 308    
Amortized cost     334
Gross unrealized gains     0
Gross unrealized losses     2
Fair value     332
Mortgage-backed securities      
Securities AFS      
Amortized cost 45,117   45,231
Gross unrealized gains 236    
Gross unrealized losses 998    
Fair value 44,355   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 108,335    
Gross unrealized gains 74    
Gross unrealized losses 1,611    
Fair value 106,798    
Amortized cost     108,344
Gross unrealized gains     77
Gross unrealized losses     971
Fair value     107,450
Agency obligations      
Securities AFS      
Amortized cost 10,689    
Gross unrealized gains 5    
Gross unrealized losses 178    
Fair value 10,516    
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 119,024   119,157
Gross unrealized gains 79    
Gross unrealized losses 1,789    
Fair value 117,314   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 9,980   8,870
Gross unrealized gains 126    
Gross unrealized losses 269    
Fair value 9,837   8,765
Amortized cost     8,870
Gross unrealized gains     140
Gross unrealized losses     245
Fair value     8,765
Foreign government      
Securities AFS      
Amortized cost 103,833   100,615
Gross unrealized gains 540    
Gross unrealized losses 598    
Fair value 103,775   100,533
Amortized cost     100,615
Gross unrealized gains     508
Gross unrealized losses     590
Fair value     100,533
Corporate      
Securities AFS      
Amortized cost 13,068    
Gross unrealized gains 43    
Gross unrealized losses 115    
Fair value 12,996    
Amortized cost     14,144
Gross unrealized gains     51
Gross unrealized losses     86
Fair value     14,109
Asset-backed securities      
Securities AFS      
Amortized cost 3,075    
Gross unrealized gains 53    
Gross unrealized losses 47    
Fair value 3,081    
Amortized cost     3,906
Gross unrealized gains     14
Gross unrealized losses     2
Fair value     3,918
Other debt securities      
Securities AFS      
Amortized cost 165    
Gross unrealized gains 0    
Gross unrealized losses 0    
Fair value 165    
Amortized cost     297
Gross unrealized gains     0
Gross unrealized losses     0
Fair value     297
Debt securities      
Securities AFS      
Amortized cost 294,262    
Gross unrealized gains 1,077    
Gross unrealized losses 3,816    
Fair value 291,523    
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 291,523   290,914
Held-to-maturity securities      
Investment Holdings      
Investments 52,492   53,320
Marketable equity securities | Fair value      
Investment Holdings      
Investments 277    
Non-marketable equity securities | Fair value      
Investment Holdings      
Investments 1,292   1,206
Non-marketable equity securities | Carried at cost      
Investment Holdings      
Investments 5,986   $ 6,850
Non-marketable securities, measured using measurement alternative      
Investment Holdings      
Investments $ 401