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 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance, beginning of period $ 11,769 $ 11,432 $ 11,795 $ 11,102
Other comprehensive income before reclassifications 55 174 532 324
Amounts reclassified from accumulated OCI to earnings 8 8 14 12
Period change 63 182 546 336
Balance, end of period 12,314 11,668 12,314 11,668
Unrealized gains and (losses) on debt securities | Debt Securities        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance, beginning of period 145 (217) (28) (363)
Other comprehensive income before reclassifications 44 127 213 270
Amounts reclassified from accumulated OCI to earnings 18 7 22 10
Period change 62 134 235 280
Balance, end of period 207 (83) 207 (83)
AOCI, Derivative Qualifying as Hedge, Excluded Component, Parent [Member] | Equity Securities [Member]        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance, beginning of period 331 7    
Other comprehensive income before reclassifications 11 47 319 54
Amounts reclassified from accumulated OCI to earnings 0 47 0  
Period change 11   319 54
Balance, end of period 342 54 342 54
Unrealized gains and (losses) on cash flow hedging derivatives        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance, beginning of period     23  
Unrealized gains (losses) for pension and other post- retirement obligations (2)        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance, beginning of period (249) (245) (251) (246)
Other comprehensive income before reclassifications 0 0 0 0
Amounts reclassified from accumulated OCI to earnings (10) 1 (8) 2
Period change (10) 1 (8) 2
Balance, end of period (259) (244) (259) (244)
Accumulated Other Comprehensive Loss        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance, beginning of period 227 (455) (256) (609)
Balance, end of period $ 290 $ (273) 290 $ (273)
Reclassification out of Accumulated Other Comprehensive Income        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Net unrealized loss on securities transfer     $ (81)