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, 2019
Dec. 31, 2018
Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]      
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets   $ 1  
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance $ 11,102 10,814 $ 10,308
Other comprehensive income before reclassifications 337 (116)  
Amounts reclassified from accumulated OCI to earnings 16 36  
Period change 353 (80)  
Tax Cuts and Job Acts of 2017, Reclassification from AOCI to Retained Earnings     0
Ending balance 11,795 11,102 10,814
AOCI attributable to parent      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Other Comprehensive Income, Other, Net of Tax     (1)
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance (609) (528) (401)
Tax Cuts and Job Acts of 2017, Reclassification from AOCI to Retained Earnings     (93)
Ending balance (256) (609) (528)
Unrealized gains and (losses) on securities | Debt securities      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Other Comprehensive Income, Other, Net of Tax     (1)
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance (363) (278)  
Other comprehensive income before reclassifications 314 (116)  
Amounts reclassified from accumulated OCI to earnings 21 32  
Period change 335 (84)  
Ending balance (28) (363) (278)
Change in fair value related to cash flow hedges      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance 0 0  
Other comprehensive income before reclassifications 23 0  
Amounts reclassified from accumulated OCI to earnings 0 0  
Period change 23 0  
Ending balance 23 0 0
Unrealized gains (losses) for pension and other post-retirement obligations      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance (246) (250)  
Other comprehensive income before reclassifications 0 0  
Amounts reclassified from accumulated OCI to earnings (5) 4  
Period change (5) 4  
Ending balance (251) (246) (250)
Reclassification out of Accumulated Other Comprehensive Income      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Transferred from AFS to HTM $ 121 $ 137 $ (95)