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INVESTMENTS - Overview (Details)
$ in Millions
12 Months Ended
Dec. 31, 2016
USD ($)
investment
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Investment Holdings      
Investments $ 353,304 $ 342,955  
Interest and dividends on investments      
Taxable interest 6,924 6,414 $ 6,311
Interest exempt from U.S. federal income tax 483 215 439
Dividend income 175 388 445
Total interest and dividend income 7,582 7,017 7,195
Gross realized investments losses, excluding losses from other-than-temporary impairment      
Gross realized investment gains 1,460 1,124 1,020
Gross realized investment losses (512) (442) (450)
Net realized gains on sale of investments [1] $ 948 682 570
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 $ 49 392 8
Net realized gain (loss) on sale of HTM securities 14 10 0
Carrying value of securities reclassified to AFS 150 243 889
OTTI losses on securities reclassified to AFS (6) (15) $ (25)
Securities available-for-sale      
Amortized cost 300,269 300,202  
Gross unrealized gains 1,721 1,375  
Gross unrealized losses 2,566 2,441  
Fair value $ 299,424 299,136  
Number of investments exceeded their fair value | investment 4,319    
Gross unrealized losses of available for sale securities that have been in an unrealized loss position for less than twelve months $ 1,394 1,334  
Gross unrealized losses of available for sale securities that have been in an unrealized loss position for twelve months or longer 1,172 1,107  
Mortgage-backed securities - U.S. agency-sponsored      
Securities available-for-sale      
Amortized cost 38,663 39,584  
Gross unrealized gains 248 367  
Gross unrealized losses 506 237  
Fair value 38,405 39,714  
Gross unrealized losses of available for sale securities that have been in an unrealized loss position for less than twelve months 436 141  
Gross unrealized losses of available for sale securities that have been in an unrealized loss position for twelve months or longer 70 96  
Mortgage-backed securities - Prime      
Securities available-for-sale      
Amortized cost 2 2  
Gross unrealized gains 0 0  
Gross unrealized losses 0 0  
Fair value 2 2  
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 43 50  
Gross unrealized gains 7 5  
Gross unrealized losses 0 0  
Fair value 50 55  
Mortgage-backed securities - Non-U.S. residential      
Securities available-for-sale      
Amortized cost 3,852 5,909  
Gross unrealized gains 13 31  
Gross unrealized losses 7 11  
Fair value 3,858 5,929  
Gross unrealized losses of available for sale securities that have been in an unrealized loss position for less than twelve months 0 7  
Gross unrealized losses of available for sale securities that have been in an unrealized loss position for twelve months or longer 7 4  
Mortgage-backed securities - Commercial      
Securities available-for-sale      
Amortized cost 357 573  
Gross unrealized gains 2 2  
Gross unrealized losses 1 4  
Fair value 358 571  
Gross unrealized losses of available for sale securities that have been in an unrealized loss position for less than twelve months 1 3  
Gross unrealized losses of available for sale securities that have been in an unrealized loss position for twelve months or longer 0 1  
Mortgage-backed securities      
Securities available-for-sale      
Amortized cost 42,917 46,118  
Gross unrealized gains 270 405  
Gross unrealized losses 514 252  
Fair value 42,673 46,271  
Gross unrealized losses of available for sale securities that have been in an unrealized loss position for less than twelve months 437 151  
Gross unrealized losses of available for sale securities that have been in an unrealized loss position for twelve months or longer 77 101  
U.S. Treasury      
Securities available-for-sale      
Amortized cost 113,606 113,096  
Gross unrealized gains 629 254  
Gross unrealized losses 452 515  
Fair value 113,783 112,835  
Gross unrealized losses of available for sale securities that have been in an unrealized loss position for less than twelve months 445 505  
Gross unrealized losses of available for sale securities that have been in an unrealized loss position for twelve months or longer 7 10  
Agency obligations      
Securities available-for-sale      
Amortized cost 9,952 10,095  
Gross unrealized gains 21 22  
Gross unrealized losses 85 37  
Fair value 9,888 10,080  
Gross unrealized losses of available for sale securities that have been in an unrealized loss position for less than twelve months 83 30  
Gross unrealized losses of available for sale securities that have been in an unrealized loss position for twelve months or longer 2 7  
U.S. Treasury and federal agency securities      
Securities available-for-sale      
Amortized cost 123,558 123,191  
Gross unrealized gains 650 276  
Gross unrealized losses 537 552  
Fair value 123,671 122,915  
Gross unrealized losses of available for sale securities that have been in an unrealized loss position for less than twelve months 528 535  
Gross unrealized losses of available for sale securities that have been in an unrealized loss position for twelve months or longer 9 17  
State and municipal securities      
Securities available-for-sale      
Amortized cost 10,797 12,099  
Gross unrealized gains 80 132  
Gross unrealized losses 757 772  
Fair value 10,120 11,459  
Gross unrealized losses of available for sale securities that have been in an unrealized loss position for less than twelve months 55 26  
Gross unrealized losses of available for sale securities that have been in an unrealized loss position for twelve months or longer 702 746  
Foreign government      
Securities available-for-sale      
Amortized cost 98,112 88,751  
Gross unrealized gains 590 402  
Gross unrealized losses 554 479  
Fair value 98,148 88,674  
Gross unrealized losses of available for sale securities that have been in an unrealized loss position for less than twelve months 243 371  
Gross unrealized losses of available for sale securities that have been in an unrealized loss position for twelve months or longer 311 108  
Corporate      
Securities available-for-sale      
Amortized cost 17,195 19,492  
Gross unrealized gains 105 129  
Gross unrealized losses 176 291  
Fair value 17,124 19,330  
Gross unrealized losses of available for sale securities that have been in an unrealized loss position for less than twelve months 129 190  
Gross unrealized losses of available for sale securities that have been in an unrealized loss position for twelve months or longer 47 101  
Asset-backed securities      
Securities available-for-sale      
Amortized cost 6,810 9,261  
Gross unrealized gains 6 5  
Gross unrealized losses 22 92  
Fair value 6,794 9,174  
Gross unrealized losses of available for sale securities that have been in an unrealized loss position for less than twelve months 0 58  
Gross unrealized losses of available for sale securities that have been in an unrealized loss position for twelve months or longer 22 34  
Other debt securities      
Securities available-for-sale      
Amortized cost 503 688  
Gross unrealized gains 0 0  
Gross unrealized losses 0 0  
Fair value 503 688  
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  
Debt securities      
Securities available-for-sale      
Amortized cost 299,892 299,600  
Gross unrealized gains 1,701 1,349  
Gross unrealized losses 2,560 2,438  
Fair value $ 299,033 298,511  
Percentage of investments gross-unrealized loss position for less than a year, rated investment grade 98.00%    
Percentage of gross-unrealized loss position for a year or more rated investment grade 76.00%    
Marketable equity securities AFS      
Securities available-for-sale      
Amortized cost $ 377 602  
Gross unrealized gains 20 26  
Gross unrealized losses 6 3  
Fair value 391 625  
Gross unrealized losses of available for sale securities that have been in an unrealized loss position for less than twelve months 2 3  
Gross unrealized losses of available for sale securities that have been in an unrealized loss position for twelve months or longer 4 0  
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 1,392    
Gross unrealized losses of available for sale securities that have been in an unrealized loss position for twelve months or longer 1,168    
Mortgage securitizations - Non-agency-sponsored      
Securities available-for-sale      
Fair value 4,268    
Securities available-for-sale (AFS)      
Investment Holdings      
Investments 299,424 299,136  
HTM debt securities      
Investment Holdings      
Investments 45,667 36,215  
Non-marketable equity securities | Fair value      
Investment Holdings      
Investments 1,774 2,088  
Non-marketable equity securities | Carried at cost      
Investment Holdings      
Investments $ 6,439 $ 5,516  
[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.