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INVESTMENTS - Overview (Details)
$ in Millions
12 Months Ended
Dec. 31, 2015
USD ($)
investment
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Investment Holdings      
Investments $ 342,955 $ 333,443  
Interest and dividends on investments      
Taxable interest 6,414 6,311 $ 5,750
Interest exempt from U.S. federal income tax 215 439 732
Dividend income 388 445 437
Total interest and dividends 7,017 7,195 6,919
Gross realized investments losses, excluding losses from other-than-temporary impairment      
Gross realized investment gains 1,124 1,020 1,606
Gross realized investment losses (442) (450) (858)
Net realized gains (losses) [1] $ 682 570 748
HTM securities sold, percent of principal collected, minimum 85.00%    
Available-for-sale Securities transferred from Held-to-maturity      
Carrying value of HTM securities sold $ 392 8 935
Net realized gain (loss) on sale of HTM securities 10 0 (128)
Carrying value of securities reclassified to available-for-sale 243 889 989
OTTI losses on securities reclassified to available-for-sale (15) (25) $ (156)
Securities available-for-sale      
Amortized cost 300,202 299,381  
Gross unrealized gains 1,375 2,527  
Gross unrealized losses 2,441 1,765  
Fair value $ 299,136 300,143  
Number of investments exceeded their fair value | investment 5,212    
Gross unrealized losses of available for sale securities that have been in an unrealized loss position for less than twelve months $ 1,334 404  
Gross unrealized losses of available for sale securities that have been in an unrealized loss position for twelve months or longer 1,107 1,361  
Mortgage-backed securities - U.S. agency-sponsored      
Securities available-for-sale      
Amortized cost 39,584 35,647  
Gross unrealized gains 367 603  
Gross unrealized losses 237 159  
Fair value 39,714 36,091  
Gross unrealized losses of available for sale securities that have been in an unrealized loss position for less than twelve months 141 30  
Gross unrealized losses of available for sale securities that have been in an unrealized loss position for twelve months or longer 96 129  
Mortgage-backed securities - Prime      
Securities available-for-sale      
Amortized cost 2 12  
Gross unrealized gains 0 0  
Gross unrealized losses 0 0  
Fair value 2 12  
Gross unrealized losses of available for sale securities that have been in an unrealized loss position for less than twelve months 0 0  
Gross unrealized losses of available for sale securities that have been in an unrealized loss position for twelve months or longer 0 0  
Mortgage-backed securities - Alt-A      
Securities available-for-sale      
Amortized cost 50 43  
Gross unrealized gains 5 1  
Gross unrealized losses 0 0  
Fair value 55 44  
Mortgage-backed securities - Non-U.S. residential      
Securities available-for-sale      
Amortized cost 5,909 8,247  
Gross unrealized gains 31 67  
Gross unrealized losses 11 7  
Fair value 5,929 8,307  
Gross unrealized losses of available for sale securities that have been in an unrealized loss position for less than twelve months 7 3  
Gross unrealized losses of available for sale securities that have been in an unrealized loss position for twelve months or longer 4 4  
Mortgage-backed securities - Commercial      
Securities available-for-sale      
Amortized cost 573 551  
Gross unrealized gains 2 6  
Gross unrealized losses 4 3  
Fair value 571 554  
Gross unrealized losses of available for sale securities that have been in an unrealized loss position for less than twelve months 3 1  
Gross unrealized losses of available for sale securities that have been in an unrealized loss position for twelve months or longer 1 2  
Mortgage-backed securities      
Securities available-for-sale      
Amortized cost 46,118 44,500  
Gross unrealized gains 405 677  
Gross unrealized losses 252 169  
Fair value 46,271 45,008  
Gross unrealized losses of available for sale securities that have been in an unrealized loss position for less than twelve months 151 34  
Gross unrealized losses of available for sale securities that have been in an unrealized loss position for twelve months or longer 101 135  
U.S. Treasury      
Securities available-for-sale      
Amortized cost 113,096 110,492  
Gross unrealized gains 254 353  
Gross unrealized losses 515 127  
Fair value 112,835 110,718  
Gross unrealized losses of available for sale securities that have been in an unrealized loss position for less than twelve months 505 119  
Gross unrealized losses of available for sale securities that have been in an unrealized loss position for twelve months or longer 10 8  
Agency obligations      
Securities available-for-sale      
Amortized cost 10,095 12,925  
Gross unrealized gains 22 60  
Gross unrealized losses 37 13  
Fair value 10,080 12,972  
Gross unrealized losses of available for sale securities that have been in an unrealized loss position for less than twelve months 30 9  
Gross unrealized losses of available for sale securities that have been in an unrealized loss position for twelve months or longer 7 4  
U.S. Treasury and federal agency securities      
Securities available-for-sale      
Amortized cost 123,191 123,417  
Gross unrealized gains 276 413  
Gross unrealized losses 552 140  
Fair value 122,915 123,690  
Gross unrealized losses of available for sale securities that have been in an unrealized loss position for less than twelve months 535 128  
Gross unrealized losses of available for sale securities that have been in an unrealized loss position for twelve months or longer 17 12  
State and municipal securities      
Securities available-for-sale      
Amortized cost 12,099 13,526  
Gross unrealized gains 132 150  
Gross unrealized losses 772 977  
Fair value 11,459 12,699  
Gross unrealized losses of available for sale securities that have been in an unrealized loss position for less than twelve months 26 15  
Gross unrealized losses of available for sale securities that have been in an unrealized loss position for twelve months or longer 746 962  
Foreign government      
Securities available-for-sale      
Amortized cost 92,384 90,249  
Gross unrealized gains 410 734  
Gross unrealized losses 593 286  
Fair value 92,201 90,697  
Gross unrealized losses of available for sale securities that have been in an unrealized loss position for less than twelve months 429 147  
Gross unrealized losses of available for sale securities that have been in an unrealized loss position for twelve months or longer 164 139  
Corporate      
Securities available-for-sale      
Amortized cost 15,859 12,033  
Gross unrealized gains 121 215  
Gross unrealized losses 177 91  
Fair value 15,803 12,157  
Gross unrealized losses of available for sale securities that have been in an unrealized loss position for less than twelve months 132 63  
Gross unrealized losses of available for sale securities that have been in an unrealized loss position for twelve months or longer 45 28  
Asset-backed securities      
Securities available-for-sale      
Amortized cost 9,261 12,534  
Gross unrealized gains 5 30  
Gross unrealized losses 92 58  
Fair value 9,174 12,506  
Gross unrealized losses of available for sale securities that have been in an unrealized loss position for less than twelve months 58 13  
Gross unrealized losses of available for sale securities that have been in an unrealized loss position for twelve months or longer 34 45  
Other debt securities      
Securities available-for-sale      
Amortized cost 688 661  
Gross unrealized gains 0 0  
Gross unrealized losses 0 0  
Fair value 688 661  
Gross unrealized losses of available for sale securities that have been in an unrealized loss position for less than twelve months 0    
Gross unrealized losses of available for sale securities that have been in an unrealized loss position for twelve months or longer 0    
Debt securities      
Securities available-for-sale      
Amortized cost 299,600 296,920  
Gross unrealized gains 1,349 2,219  
Gross unrealized losses 2,438 1,721  
Fair value $ 298,511 297,418  
Percentage of investments gross-unrealized loss position for less than a year, rated investment grade 94.00%    
Percentage of gross-unrealized loss position for a year or more rated investement grade 90.00%    
Equity securities      
Securities available-for-sale      
Amortized cost $ 602 2,461  
Gross unrealized gains 26 308  
Gross unrealized losses 3 44  
Fair value 625 2,725  
Gross unrealized losses of available for sale securities that have been in an unrealized loss position for less than twelve months 3 4  
Gross unrealized losses of available for sale securities that have been in an unrealized loss position for twelve months or longer 0 40  
Fixed income securities      
Securities available-for-sale      
Gross unrealized losses of available for sale securities that have been in an unrealized loss position for less than twelve months 1,331    
Gross unrealized losses of available for sale securities that have been in an unrealized loss position for twelve months or longer 1,107    
Mortgage securitizations - Non-agency-sponsored      
Securities available-for-sale      
Fair value 6,557    
Securities available-for-sale (AFS)      
Investment Holdings      
Investments 299,136 300,143  
Held-to-maturity Securities      
Investment Holdings      
Investments 36,215 23,921  
Non-marketable equity securities | Fair value      
Investment Holdings      
Investments 2,088 2,758  
Non-marketable equity securities | Carried at cost      
Investment Holdings      
Investments $ 5,516 $ 6,621  
[1] Certain prior-period revenue and expense lines and totals were reclassified to conform to the current period’s presentation. See Note 3 to the Consolidated Financial Statements.