Annual report pursuant to Section 13 and 15(d)

OTHER COMPREHENSIVE INCOME - AOCI Roll Forward (Details)

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OTHER COMPREHENSIVE INCOME - AOCI Roll Forward (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance $ 12,993    
Other comprehensive income before reclassifications (475) $ 417 $ 337
Amounts reclassified from accumulated OCI to earnings 54 31 16
Period change (421) 448 353
Ending balance 19,297 12,993  
Transferred from AFS to HTM (35) (69) (121)
AOCI attributable to parent      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance 192 (256) (609)
Ending balance (229) 192 (256)
Unrealized gains and (losses) on securities | Debt securities      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance 188 (28) (363)
Other comprehensive income before reclassifications (367) 183 314
Amounts reclassified from accumulated OCI to earnings 26 33 21
Period change (341) 216 335
Ending balance (153) 188 (28)
Change in fair value related to cash flow hedges      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance 257 23 0
Other comprehensive income before reclassifications (105) 234 23
Amounts reclassified from accumulated OCI to earnings 0 0 0
Period change (105) 234 23
Ending balance 152 257 23
Translation adjustments, net of hedges      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance 0 0 0
Other comprehensive income before reclassifications (3) 0 0
Amounts reclassified from accumulated OCI to earnings 0 0 0
Period change (3) 0 0
Ending balance (3) 0 0
Unrealized (losses) gains for pension and other post-retirement obligations      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance (253) (251) (246)
Other comprehensive income before reclassifications 0 0 0
Amounts reclassified from accumulated OCI to earnings 28 (2) (5)
Period change 28 (2) (5)
Ending balance $ (225) $ (253) $ (251)