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INVESTMENTS - Overview (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Investment Holdings      
Investments $ 349,281   $ 358,607
Interest and dividends on investments      
Taxable interest 2,372 $ 2,042  
Interest exempt from U.S. federal income tax 127 130  
Dividend income 49 62  
Total interest and dividend income 2,548 2,234  
Gross realized investments losses, excluding losses from other-than-temporary impairment      
Gross realized investment gains 168 345  
Gross realized investment losses (38) (175)  
Net realized gains on sale of investments 130 $ 170  
Debt securities AFS      
Amortized cost 275,989   290,423
Fair value 275,132   288,038
Mortgage-backed securities - U.S. agency-sponsored      
Debt securities AFS      
Amortized cost 39,228   43,504
Gross unrealized gains 539   241
Gross unrealized losses 434   725
Fair value 39,333   43,020
Mortgage-backed securities - Alt-A      
Debt securities AFS      
Amortized cost 1   1
Gross unrealized gains 0   0
Gross unrealized losses 0   0
Fair value 1   1
Mortgage-backed securities - Non-U.S. residential      
Debt securities AFS      
Amortized cost 1,117   1,310
Gross unrealized gains 4   4
Gross unrealized losses 1   2
Fair value 1,120   1,312
Commercial and other      
Debt securities AFS      
Amortized cost 138   173
Gross unrealized gains 1   1
Gross unrealized losses 1   2
Fair value 138   172
Mortgage-backed securities      
Debt securities AFS      
Amortized cost 40,484   44,988
Gross unrealized gains 544   246
Gross unrealized losses 436   729
Fair value 40,592   44,505
U.S. Treasury      
Debt securities AFS      
Amortized cost 100,267   109,376
Gross unrealized gains 25   33
Gross unrealized losses 1,003   1,339
Fair value 99,289   108,070
Agency obligations      
Debt securities AFS      
Amortized cost 8,472   9,283
Gross unrealized gains 2   1
Gross unrealized losses 90   132
Fair value 8,384   9,152
U.S. Treasury and federal agency securities      
Debt securities AFS      
Amortized cost 108,739   118,659
Gross unrealized gains 27   34
Gross unrealized losses 1,093   1,471
Fair value 107,673   117,222
State and municipal securities      
Debt securities AFS      
Amortized cost 8,012   9,372
Gross unrealized gains 162   96
Gross unrealized losses 65   262
Fair value 8,109   9,206
Foreign government      
Debt securities AFS      
Amortized cost 101,296   100,872
Gross unrealized gains 455   415
Gross unrealized losses 395   596
Fair value 101,356   100,691
Corporate      
Debt securities AFS      
Amortized cost 12,366   11,714
Gross unrealized gains 59   42
Gross unrealized losses 115   157
Fair value 12,310   11,599
Asset-backed securities      
Debt securities AFS      
Amortized cost 1,421   845
Gross unrealized gains 1   2
Gross unrealized losses 2   4
Fair value 1,420   843
Other debt securities      
Debt securities AFS      
Amortized cost 3,671   3,973
Gross unrealized gains 1   0
Gross unrealized losses 0   1
Fair value 3,672   3,972
Debt securities      
Debt securities AFS      
Amortized cost 275,989   290,423
Gross unrealized gains 1,249   835
Gross unrealized losses 2,106   3,220
Fair value 275,132   288,038
Debt securities available-for-sale (AFS)      
Investment Holdings      
Investments 275,132   288,038
Debt securities held-to-maturity securities (HTM)      
Investment Holdings      
Investments 66,842   63,357
Marketable equity securities | Fair value      
Investment Holdings      
Investments 208   220
Non-marketable equity securities | Fair value      
Investment Holdings      
Investments 804   889
Non-marketable equity securities | Carried at cost      
Investment Holdings      
Investments 5,665   5,565
Non-marketable securities, measured using measurement alternative      
Investment Holdings      
Investments $ 630   $ 538