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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 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Dec. 31, 2016
Change in accumulated other comprehensive income (loss)            
Balance, beginning of period     $ 201,672      
Balance, end of period $ 200,968 $ 231,107 200,968 $ 231,107    
Net unrealized gains (losses) on investment securities            
Change in accumulated other comprehensive income (loss)            
Balance, beginning of period (2,219) (75) (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 (433) 101 (1,383) 435    
Increase (decrease) due to amounts reclassified from AOCI (65) (128) (173) (242)    
Total other comprehensive income (498) (27) (1,556) 193    
Balance, end of period (2,717) (102) (2,717) (102)    
Debt valuation adjustment (DVA)            
Change in accumulated other comprehensive income (loss)            
Balance, beginning of period (793) (412) (921) (352)    
Adjustment to opening balance, net of taxes         0 0
Adjusted balance, beginning of period         (921) (352)
Other comprehensive income before reclassifications 316 (79) 417 (134)    
Increase (decrease) due to amounts reclassified from AOCI 2 (5) 29 (10)    
Total other comprehensive income 318 (84) 446 (144)    
Balance, end of period (475) (496) (475) (496)    
Cash flow hedges            
Change in accumulated other comprehensive income (loss)            
Balance, beginning of period (920) (562) (698) (560)    
Adjustment to opening balance, net of taxes         0 0
Adjusted balance, beginning of period         (698) (560)
Other comprehensive income before reclassifications (36) 62 (279) 86    
Increase (decrease) due to amounts reclassified from AOCI (65) 55 (44) 29    
Total other comprehensive income (101) 117 (323) 115    
Balance, end of period (1,021) (445) (1,021) (445)    
Benefit plans            
Change in accumulated other comprehensive income (loss)            
Balance, beginning of period (6,095) (5,176) (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 261 (173) 302 (222)    
Increase (decrease) due to amounts reclassified from AOCI 40 38 87 75    
Total other comprehensive income 301 (135) 389 (147)    
Balance, end of period (5,794) (5,311) (5,794) (5,311)    
Foreign currency translation adjustment (CTA), net of hedges            
Change in accumulated other comprehensive income (loss)            
Balance, beginning of period (24,588) (24,188) (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 (2,867) 643 (1,747) 2,108    
Increase (decrease) due to amounts reclassified from AOCI 0 0 0 (147)    
Total other comprehensive income (2,867) 643 (1,747) 1,961    
Balance, end of period (27,455) (23,545) (27,455) (23,545)    
Excluded component of fair value hedges            
Change in accumulated other comprehensive income (loss)            
Balance, beginning of period (4) 0 0 0    
Adjustment to opening balance, net of taxes         0 0
Adjusted balance, beginning of period         0 0
Other comprehensive income before reclassifications (28) 0 (32) 0    
Increase (decrease) due to amounts reclassified from AOCI 0 0 0 0    
Total other comprehensive income (28) 0 (32) 0    
Balance, end of period (32) 0 (32) 0    
Accumulated other comprehensive income (loss)            
Change in accumulated other comprehensive income (loss)            
Balance, beginning of period (34,619) (30,413) (34,668) (32,381)    
Adjustment to opening balance, net of taxes [1]         (3) 504
Adjusted balance, beginning of period         $ (34,671) $ (31,877)
Other comprehensive income before reclassifications (2,787) 554 (2,722) 2,273    
Increase (decrease) due to amounts reclassified from AOCI (88) (40) (101) (295)    
Total other comprehensive income (2,875) 514 (2,823) 1,978    
Balance, end of period $ (37,494) $ (29,899) $ (37,494) $ (29,899)    
[1] See Note 1 to the Consolidated Financial Statements for additional details.