Quarterly report pursuant to Section 13 or 15(d)

OTHER COMPREHENSIVE INCOME OTHER COMPREHENSIVE INCOME - AOCI Roll Forward (Details)

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OTHER COMPREHENSIVE INCOME OTHER COMPREHENSIVE INCOME - AOCI Roll Forward (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Mar. 31, 2022
Mar. 31, 2021
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance, beginning of period     $ 19,297  
Other comprehensive income (loss) before reclassifications     (1,094) $ (257)
Net unrealized gains (losses) on net investment hedges     9 9
Period change     (1,085) (248)
Balance, end of period $ 18,452   18,452  
Unrealized gains and (losses) on debt securities        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance, beginning of period     (153) 188
Other comprehensive income (loss) before reclassifications     (1,186) (223)
Net unrealized gains (losses) on net investment hedges     7 7
Period change     (1,179) (216)
Balance, end of period (1,332) $ (28) (1,332) (28)
Net impact of fair value hedges on available-for-sale securities        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance, beginning of period     89 2
Other comprehensive income (loss) before reclassifications     332 34
Net unrealized gains (losses) on net investment hedges     0 0
Period change     332 34
Balance, end of period 421 36 421 36
Net unrealized gains (losses) on net investment hedges        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance, beginning of period     63 255
Other comprehensive income (loss) before reclassifications     (240) (68)
Net unrealized gains (losses) on net investment hedges     0 0
Period change     (240) (68)
Balance, end of period (177) 187 (177) 187
Translation adjustments, net of hedges        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance, beginning of period     (3) 0
Other comprehensive income (loss) before reclassifications     0 0
Net unrealized gains (losses) on net investment hedges     0 0
Period change     0 0
Balance, end of period (3) 0 (3) 0
Unrealized gains (losses) for pension and other post-retirement obligations        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance, beginning of period     (225) (253)
Other comprehensive income (loss) before reclassifications     0 0
Net unrealized gains (losses) on net investment hedges     2 2
Period change     2 2
Balance, end of period (223) (251) (223) (251)
Accumulated Other Comprehensive Income (Loss)        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance, beginning of period     (229) 192
Balance, end of period (1,314) (56) $ (1,314) $ (56)
Reclassification out of Accumulated Other Comprehensive Income        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Net unrealized loss on securities transfer $ 78 $ 46