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INVESTMENTS - Overview (Details)
$ in Millions
12 Months Ended
Dec. 31, 2017
USD ($)
investment
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Investment Holdings      
Investments $ 352,290 $ 353,304  
Interest and dividends on investments      
Taxable interest 7,538 6,858 $ 6,433
Interest exempt from U.S. federal income tax 535 549 196
Dividend income 222 175 388
Total interest and dividend income 8,295 7,582 7,017
Gross realized investments losses, excluding losses from other-than-temporary impairment      
Gross realized investment gains 1,039 1,460 1,124
Gross realized investment losses (261) (512) (442)
Net realized gains on sale of investments [1] $ 778 948 682
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 $ 81 49 392
Net realized gain (loss) on sale of HTM securities 13 14 10
Carrying value of securities reclassified to AFS 74 150 243
OTTI losses on securities reclassified to AFS 0 (6) $ (15)
Securities available-for-sale      
Amortized cost 292,406 300,269  
Gross unrealized gains 1,035 1,721  
Gross unrealized losses 2,527 2,566  
Fair value $ 290,914 299,424  
Number of investments exceeded their fair value | investment 4,600    
Less than 12 months $ 1,854 1,394  
12 months or longer 673 1,172  
Mortgage-backed securities - U.S. agency-sponsored      
Securities available-for-sale      
Amortized cost 42,116 38,663  
Gross unrealized gains 125 248  
Gross unrealized losses 500 506  
Fair value 41,741 38,405  
Less than 12 months 438 436  
12 months or longer 62 70  
Mortgage-backed securities - Prime      
Securities available-for-sale      
Amortized cost 11 2  
Gross unrealized gains 6 0  
Gross unrealized losses 0 0  
Fair value 17 2  
Less than 12 months 0 0  
12 months or longer 0 0  
Mortgage-backed securities - Alt-A      
Securities available-for-sale      
Amortized cost 26 43  
Gross unrealized gains 90 7  
Gross unrealized losses 0 0  
Fair value 116 50  
Mortgage-backed securities - Non-U.S. residential      
Securities available-for-sale      
Amortized cost 2,744 3,852  
Gross unrealized gains 13 13  
Gross unrealized losses 6 7  
Fair value 2,751 3,858  
Less than 12 months 6 0  
12 months or longer 0 7  
Mortgage-backed securities - Commercial      
Securities available-for-sale      
Amortized cost 334 357  
Gross unrealized gains 0 2  
Gross unrealized losses 2 1  
Fair value 332 358  
Less than 12 months 1 1  
12 months or longer 1 0  
Mortgage-backed securities      
Securities available-for-sale      
Amortized cost 45,231 42,917  
Gross unrealized gains 234 270  
Gross unrealized losses 508 514  
Fair value 44,957 42,673  
Less than 12 months 445 437  
12 months or longer 63 77  
U.S. Treasury      
Securities available-for-sale      
Amortized cost 108,344 113,606  
Gross unrealized gains 77 629  
Gross unrealized losses 971 452  
Fair value 107,450 113,783  
Less than 12 months 856 445  
12 months or longer 115 7  
Agency obligations      
Securities available-for-sale      
Amortized cost 10,813 9,952  
Gross unrealized gains 7 21  
Gross unrealized losses 124 85  
Fair value 10,696 9,888  
Less than 12 months 110 83  
12 months or longer 14 2  
U.S. Treasury and federal agency securities      
Securities available-for-sale      
Amortized cost 119,157 123,558  
Gross unrealized gains 84 650  
Gross unrealized losses 1,095 537  
Fair value 118,146 123,671  
Less than 12 months 966 528  
12 months or longer 129 9  
State and municipal securities      
Securities available-for-sale      
Amortized cost 8,870 10,797  
Gross unrealized gains 140 80  
Gross unrealized losses 245 757  
Fair value 8,765 10,120  
Less than 12 months 11 55  
12 months or longer 234 702  
Foreign government      
Securities available-for-sale      
Amortized cost 100,615 98,112  
Gross unrealized gains 508 590  
Gross unrealized losses 590 554  
Fair value 100,533 98,148  
Less than 12 months 356 243  
12 months or longer 234 311  
Corporate      
Securities available-for-sale      
Amortized cost 14,144 17,195  
Gross unrealized gains 51 105  
Gross unrealized losses 86 176  
Fair value 14,109 17,124  
Less than 12 months 74 129  
12 months or longer 12 47  
Asset-backed securities      
Securities available-for-sale      
Amortized cost 3,906 6,810  
Gross unrealized gains 14 6  
Gross unrealized losses 2 22  
Fair value 3,918 6,794  
Less than 12 months 1 0  
12 months or longer 1 22  
Other debt securities      
Securities available-for-sale      
Amortized cost 297 503  
Gross unrealized gains 0 0  
Gross unrealized losses 0 0  
Fair value 297 503  
Less than 12 months 0 0  
12 months or longer 0 0  
Debt securities      
Securities available-for-sale      
Amortized cost 292,220 299,892  
Gross unrealized gains 1,031 1,701  
Gross unrealized losses 2,526 2,560  
Fair value $ 290,725 299,033  
Percentage of investments gross-unrealized loss position for less than a year, rated investment grade 99.00%    
Percentage of gross-unrealized loss position for a year or more rated investment grade 94.00%    
Marketable equity securities AFS      
Securities available-for-sale      
Amortized cost $ 186 377  
Gross unrealized gains 4 20  
Gross unrealized losses 1 6  
Fair value 189 391  
Less than 12 months 1 2  
12 months or longer 0 4  
Fixed income securities      
Securities available-for-sale      
Less than 12 months 1,854    
12 months or longer 672    
Securities available-for-sale (AFS)      
Investment Holdings      
Investments 290,914 299,424  
HTM debt securities      
Investment Holdings      
Investments 53,320 45,667  
Non-marketable equity securities | Fair value      
Investment Holdings      
Investments 1,206 1,774  
Non-marketable equity securities | Carried at cost      
Investment Holdings      
Investments $ 6,850 $ 6,439  
[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.