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, 2020
Mar. 31, 2019
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Balance, beginning of period $ (11,795) $ (11,102)
Other comprehensive income before reclassifications 477 150
Amounts reclassified from accumulated OCI to earnings 6 4
Period change 483 154
Balance, end of period (11,769) (11,432)
Unrealized gains and (losses) on debt securities | Debt Securities    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Balance, beginning of period (28) (363)
Other comprehensive income before reclassifications 169 143
Amounts reclassified from accumulated OCI to earnings 4 3
Period change 173 146
Balance, end of period (145) (217)
AOCI, Derivative Qualifying as Hedge, Excluded Component, Parent [Member] | Equity Securities [Member]    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Other comprehensive income before reclassifications 308 7
Amounts reclassified from accumulated OCI to earnings 0  
Period change 308 7
Balance, end of period (331) (7)
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    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Balance, beginning of period (251) (246)
Other comprehensive income before reclassifications 0 0
Amounts reclassified from accumulated OCI to earnings 2 1
Period change 2 1
Balance, end of period 249 (245)
Accumulated Other Comprehensive Loss    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Balance, beginning of period (256) (609)
Balance, end of period (227) $ (455)
Reclassification out of Accumulated Other Comprehensive Income    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Net unrealized loss on securities transfer $ (87)