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, 2021
Dec. 31, 2020
Mar. 31, 2020
Mar. 31, 2021
Mar. 31, 2020
AOCI Attributable to Parent, Net of Tax [Roll Forward]          
Balance, beginning of period       $ 12,993 $ 11,795
Other comprehensive income before reclassifications       (257) 477
Amounts reclassified from accumulated OCI to earnings       9 6
Period change       (248) 483
Balance, end of period $ 13,600 $ 12,993 $ 11,769 13,600 11,769
Accumulated Other Comprehensive Gain (Loss)          
AOCI Attributable to Parent, Net of Tax [Roll Forward]          
Balance, beginning of period       192 (256)
Balance, end of period (56) 192 227 (56) 227
Unrealized gains and (losses) on debt securities | Debt Securities          
AOCI Attributable to Parent, Net of Tax [Roll Forward]          
Balance, beginning of period       188 (28)
Other comprehensive income before reclassifications       (223) 169
Amounts reclassified from accumulated OCI to earnings       7 4
Period change       (216) 173
Balance, end of period (28) 188 145 (28) 145
Change in fair value related to cash flow hedges | Equity securities          
AOCI Attributable to Parent, Net of Tax [Roll Forward]          
Balance, beginning of period       257 23
Other comprehensive income before reclassifications       (34) 308
Amounts reclassified from accumulated OCI to earnings       0 0
Period change       (34) 308
Balance, end of period 223 257 331 223 331
Unrealized gains (losses) for pension and other post-retirement obligations          
AOCI Attributable to Parent, Net of Tax [Roll Forward]          
Balance, beginning of period       (253) (251)
Other comprehensive income before reclassifications       0 0
Amounts reclassified from accumulated OCI to earnings       2 2
Period change       2 2
Balance, end of period (251) (253) (249) $ (251) $ (249)
Reclassification out of Accumulated Other Comprehensive Income          
AOCI Attributable to Parent, Net of Tax [Roll Forward]          
Net unrealized loss on securities transfer $ (60) $ (69) $ (87)