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, 2018
Dec. 31, 2017
Dec. 31, 2016
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 10,814 $ 10,308 $ 6,595
Other comprehensive income before reclassifications (116) (62)  
Amounts reclassified from accumulated OCI to earnings 36 28  
Period change (80) (34)  
Tax Cuts and Job Acts of 2017, Reclassification from AOCI to Retained Earnings   0  
Ending balance 11,102 10,814 10,308
AOCI attributable to parent      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance (528) (401) (226)
Tax Cuts and Job Acts of 2017, Reclassification from AOCI to Retained Earnings   (93)  
Ending balance (609) (528) (401)
Unrealized gains and (losses) on securities | Debt securities      
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 (278) (193)  
Other comprehensive income before reclassifications (116) (54)  
Amounts reclassified from accumulated OCI to earnings 32 17  
Period change (84) (37)  
Tax Cuts and Job Acts of 2017, Reclassification from AOCI to Retained Earnings   48  
Ending balance (363) (278) (193)
Unrealized gains (losses) on cash flow hedging derivatives      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance 0 (3)  
Other comprehensive income before reclassifications 0 2  
Amounts reclassified from accumulated OCI to earnings 0 1  
Period change 0 3  
Ending balance 0 0 (3)
Unrealized gains (losses) for pension and other post-retirement obligations      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance (250) (205)  
Other comprehensive income before reclassifications 0 (10)  
Amounts reclassified from accumulated OCI to earnings 4 10  
Period change 4 0  
Tax Cuts and Job Acts of 2017, Reclassification from AOCI to Retained Earnings   (45)  
Ending balance (246) (250) (205)
Reclassification out of Accumulated Other Comprehensive Income      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Transferred from AFS to HTM (137)   $ (82)
Reclassification out of Accumulated Other Comprehensive Income | Unrealized gains and (losses) on securities      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Amounts reclassified from accumulated OCI to earnings 32 17  
Reclassification out of Accumulated Other Comprehensive Income | Unrealized gains (losses) on cash flow hedging derivatives      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Amounts reclassified from accumulated OCI to earnings 0 1  
Reclassification out of Accumulated Other Comprehensive Income | Unrealized gains (losses) for pension and other post-retirement obligations      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Amounts reclassified from accumulated OCI to earnings $ 7 $ 10