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CHANGES IN ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (AOCI) - Schedule of Pre-Tax and After-Tax (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Jan. 01, 2018
Jan. 01, 2017
Jan. 01, 2016
Dec. 31, 2015
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]              
Total equity $ 197,074 $ 201,672 $ 226,143        
OCI, Net of Tax [Abstract]              
Pretax (2,850) 4 (3,569)        
Tax effect 351 (2,795) 547        
Change, net of taxes (2,499) (2,791) (3,022)        
Accumulated other comprehensive income (loss) (AOCI) (37,170) (34,668)          
Net unrealized gains (losses) on investment securities              
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]              
Total equity (2,250) (1,158) (799)       $ (907)
Adjustment to opening balance, net of taxes       $ (3) $ 504 $ 0  
Adjusted balance       (1,161) (295) (907)  
OCI, Net of Tax [Abstract]              
Pretax (1,435) (1,088) 167        
Tax effect 346 225 (59)        
Change, net of taxes (1,089) (863) 108        
Debt valuation adjustment (DVA)              
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]              
Total equity 192 (921) (352)       0
Adjustment to opening balance, net of taxes       0 0 (15)  
Adjusted balance       (921) (352) (15)  
OCI, Net of Tax [Abstract]              
Pretax 1,415 (680) (538)        
Tax effect (302) 111 201        
Change, net of taxes 1,113 (569) (337)        
Cash flow hedges              
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]              
Total equity (728) (698) (560)       (617)
Adjustment to opening balance, net of taxes       0 0 0  
Adjusted balance       (698) (560) (617)  
OCI, Net of Tax [Abstract]              
Change, net of taxes (30) (138) 57        
Benefit plans              
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]              
Total equity (6,257) (6,183) (5,164)       (5,116)
Adjustment to opening balance, net of taxes       0 0 0  
Adjusted balance       (6,183) (5,164) (5,116)  
OCI, Net of Tax [Abstract]              
Pretax (94) 14 (78)        
Tax effect 20 (1,033) 30        
Change, net of taxes (74) (1,019) (48)        
Foreign currency translation adjustment              
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]              
Total equity (28,070) (25,708) (25,506)       (22,704)
Adjustment to opening balance, net of taxes       0 0 0  
Adjusted balance       (25,708) (25,506) (22,704)  
OCI, Net of Tax [Abstract]              
Pretax (2,624) 1,795 (3,204)        
Tax effect 262 (1,997) 402        
Change, net of taxes (2,362) (202) (2,802)        
Excluded component of fair value hedges              
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]              
Total equity (57) 0 0       0
Adjustment to opening balance, net of taxes       0 0 0  
Adjusted balance       0 0 0  
OCI, Net of Tax [Abstract]              
Change, net of taxes (57) 0 0        
Accumulated other comprehensive income (loss)              
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]              
AOCI, beginning balance, pretax (41,228) (42,035) (38,440)        
AOCI, beginning balance, tax effect 6,560 9,654 9,096        
Total equity (37,170) (34,668) (32,381)       (29,344)
Adjustment to opening balance, Pretax       (4) 803 (26)  
Adjustment to opening balance, Tax Effect       1 (299) 11  
Adjustment to opening balance, net of taxes   (3) [1] 504 [1] (3) 504 (15) (15) [1]
Adjusted balance, Pretax       (41,232) (41,232) (38,466)  
Adjusted Balance, Tax Effect       6,561 9,355 9,107  
AOCI, ending balance, pretax (44,082) (41,228) (42,035)        
AOCI, ending balance, tax effect 6,912 6,560 9,654        
Adjusted balance   (34,671) (31,877) $ (34,671) $ (31,877) (29,359) $ (29,359)
OCI, Net of Tax [Abstract]              
Change, net of taxes [2] (2,499) (2,791) (3,022)        
Cash flow hedges | Cash flow hedges              
OCI, Net of Tax [Abstract]              
Pretax (38) (37) 84        
Tax effect 8 (101) (27)        
Change, net of taxes (30) $ (138) $ 57        
Fair value hedges | Excluded component of fair value hedges              
OCI, Net of Tax [Abstract]              
Pretax (74)            
Tax effect 17            
Change, net of taxes $ (57)            
Accounting Standards Update 2016-01              
OCI, Net of Tax [Abstract]              
Accumulated other comprehensive income (loss) (AOCI)           $ (15)  
[1] See Note 1 to the Consolidated Financial Statements for additional details.
[2] Includes the impact of ASU 2018-02, which transferred those amounts from AOCI to Retained earnings. See Notes 1 and 19 to the Consolidated Financial Statements.