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CHANGES IN ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (AOCI) - Change in Each Component of AOCI (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Jun. 30, 2018
Dec. 31, 2017
Jun. 30, 2017
Dec. 31, 2016
Change in accumulated other comprehensive income (loss)                
Balance, beginning of period     $ 201,672          
Balance, end of period $ 197,863 $ 228,622 197,863 $ 228,622        
Net unrealized gains (losses) on investment securities                
Change in accumulated other comprehensive income (loss)                
Balance, beginning of period (2,717) (102) (1,158) (799)        
Adjustment to opening balance, net of taxes           $ (3)   $ 504
Adjusted balance, beginning of period           (1,161)   (295)
Other comprehensive income before reclassifications (601) 60 (1,984) 495        
Increase (decrease) due to amounts reclassified from AOCI (4) (126) (177) (368)        
Total other comprehensive income (605) (66) (2,161) 127        
Balance, end of period (3,322) (168) (3,322) (168)        
Debt valuation adjustment (DVA)                
Change in accumulated other comprehensive income (loss)                
Balance, beginning of period (475) (496) (921) (352)        
Adjustment to opening balance, net of taxes           0   0
Adjusted balance, beginning of period           (921)   (352)
Other comprehensive income before reclassifications (294) (125) 123 (259)        
Increase (decrease) due to amounts reclassified from AOCI 7 2 36 (8)        
Total other comprehensive income (287) (123) 159 (267)        
Balance, end of period (762) (619) (762) (619)        
Cash flow hedges                
Change in accumulated other comprehensive income (loss)                
Balance, beginning of period (1,021) (445) (698) (560)        
Adjustment to opening balance, net of taxes           0   0
Adjusted balance, beginning of period           (698)   (560)
Other comprehensive income before reclassifications (114) (27) (393) 59        
Increase (decrease) due to amounts reclassified from AOCI 40 35 (4) 64        
Total other comprehensive income (74) 8 (397) 123        
Balance, end of period (1,095) (437) (1,095) (437)        
Benefit plans                
Change in accumulated other comprehensive income (loss)                
Balance, beginning of period (5,794) (5,311) (6,183) (5,164)        
Adjustment to opening balance, net of taxes           0   0
Adjusted balance, beginning of period           (6,183)   (5,164)
Other comprehensive income before reclassifications (14) (71) 288 (293)        
Increase (decrease) due to amounts reclassified from AOCI 40 42 127 117        
Total other comprehensive income 26 (29) 415 (176)        
Balance, end of period (5,768) (5,340) (5,768) (5,340)        
Foreign currency translation adjustment (CTA), net of hedges                
Change in accumulated other comprehensive income (loss)                
Balance, beginning of period (27,455) (23,545) (25,708) (25,506)        
Adjustment to opening balance, net of taxes           0   0
Adjusted balance, beginning of period           (25,708)   (25,506)
Other comprehensive income before reclassifications (221) 218 (1,968) 2,326        
Increase (decrease) due to amounts reclassified from AOCI 0 0 0 (147)        
Total other comprehensive income (221) 218 (1,968) 2,179        
Balance, end of period (27,676) (23,327) (27,676) (23,327)        
Excluded component of fair value hedges                
Change in accumulated other comprehensive income (loss)                
Balance, beginning of period (32) 0 0 0        
Adjustment to opening balance, net of taxes           0   0
Adjusted balance, beginning of period           0   0
Other comprehensive income before reclassifications 10 0 (22) 0        
Increase (decrease) due to amounts reclassified from AOCI 0 0 0 0        
Total other comprehensive income 10 0 (22) 0        
Balance, end of period (22) 0 (22) 0        
Accumulated other comprehensive income (loss)                
Change in accumulated other comprehensive income (loss)                
Balance, beginning of period (37,494) (29,899) (34,668) (32,381)        
Adjustment to opening balance, net of taxes [1]         $ 0 (3) $ 0 504
Adjusted balance, beginning of period         $ (37,494) $ (34,671) $ (29,899) $ (31,877)
Other comprehensive income before reclassifications (1,234) 55 (3,956) 2,328        
Increase (decrease) due to amounts reclassified from AOCI 83 (47) (18) (342)        
Total other comprehensive income (1,151) 8 (3,974) 1,986        
Balance, end of period $ (38,645) $ (29,891) $ (38,645) $ (29,891)        
[1] See Note 1 to the Consolidated Financial Statements for additional details.