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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, 2019
Dec. 31, 2018
Dec. 31, 2017
Jan. 01, 2017
Dec. 31, 2016
Jan. 01, 2016
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]            
Total equity $ 193,946 $ 197,074 $ 201,672      
OCI, Net of Tax [Abstract]            
Pretax 1,310 (2,850) 4      
Tax effect (458) 351 (2,795)      
Change, net of taxes 852 (2,499) (2,791)      
Accumulated other comprehensive income (loss) (AOCI) (36,318) (37,170)        
Net unrealized gains (losses) on investment securities            
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]            
Total equity (265) (2,250) (1,158)   $ (799)  
Adjustment to opening balance, net of taxes       $ (3)   $ 504
Adjusted balance       (1,161)   (295)
OCI, Net of Tax [Abstract]            
Pretax 2,633 (1,435) (1,088)      
Impact of Tax Reform     223      
Tax effect (648) 346 225      
Change, net of taxes 1,985 (1,089) (863)      
Debt valuation adjustment (DVA)            
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]            
Total equity (944) 192 (921)   (352)  
Adjustment to opening balance, net of taxes       0   0
Adjusted balance       (921)   (352)
OCI, Net of Tax [Abstract]            
Pretax (1,473) 1,415 (680)      
Impact of Tax Reform     139      
Tax effect 337 (302) 111      
Change, net of taxes (1,136) 1,113 (569)      
Cash flow hedges            
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]            
Total equity 123 (728) (698)   (560)  
Adjustment to opening balance, net of taxes       0   0
Adjusted balance       (698)   (560)
OCI, Net of Tax [Abstract]            
Impact of Tax Reform     113      
Change, net of taxes 851 (30) (138)      
Benefit plans            
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]            
Total equity (6,809) (6,257) (6,183)   (5,164)  
Adjustment to opening balance, net of taxes       0   0
Adjusted balance       (6,183)   (5,164)
OCI, Net of Tax [Abstract]            
Pretax (671) (94) 14      
Impact of Tax Reform 0 0 1,020      
Tax effect 119 20 (1,033)      
Change, net of taxes (552) (74) (1,019)      
Foreign currency translation adjustment            
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]            
Total equity (28,391) (28,070) (25,708)   (25,506)  
Adjustment to opening balance, net of taxes       0   0
Adjusted balance       (25,708)   (25,506)
OCI, Net of Tax [Abstract]            
Pretax (332) (2,624) 1,795      
Impact of Tax Reform     1,809      
Tax effect 11 262 (1,997)      
Change, net of taxes (321) (2,362) (202)      
Excluded component of fair value hedges            
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]            
Total equity (32) (57) 0   0  
Adjustment to opening balance, net of taxes       0   0
Adjusted balance       0   0
OCI, Net of Tax [Abstract]            
Impact of Tax Reform     0      
Change, net of taxes 25 (57) 0      
Accumulated other comprehensive income (loss)            
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]            
AOCI, beginning balance, pretax (44,082) (41,228) (42,035)      
AOCI, beginning balance, tax effect 6,912 6,560 9,654      
Total equity (36,318) (37,170) (34,668)   (32,381)  
Adjustment to opening balance, Pretax       (4)   803
Adjustment to opening balance, Tax Effect       1   (299)
Adjustment to opening balance, net of taxes   0 [1] (3) [1] (3) 504 [1] 504
Adjusted balance, Pretax       (41,232)   (41,232)
Adjusted Balance, Tax Effect       6,561   9,355
AOCI, ending balance, pretax (42,772) (44,082) (41,228)      
AOCI, ending balance, tax effect 6,454 6,912 6,560      
Adjusted balance   (37,170) (34,671) $ (34,671) $ (31,877) $ (31,877)
OCI, Net of Tax [Abstract]            
Impact of Tax Reform     3,304      
Change, net of taxes [2] 852 (2,499) (2,791)      
Cash flow hedges | Cash flow hedges            
OCI, Net of Tax [Abstract]            
Pretax 1,120 (38) (37)      
Tax effect (269) 8 (101)      
Change, net of taxes 851 (30) $ (138)      
Fair value hedges | Excluded component of fair value hedges            
OCI, Net of Tax [Abstract]            
Pretax 33 (74)        
Tax effect (8) 17        
Change, net of taxes $ 25 $ (57)        
[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 2017 Retained earnings. See Notes 1 and 19 to the Consolidated Financial Statements.