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, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
AOCI Attributable to Parent, Net of Tax [Roll Forward]            
Balance, beginning of period         $ 12,993  
Other comprehensive income before reclassifications     $ 23 $ 55 (234) $ 532
Amounts reclassified from accumulated OCI to earnings     14 8 23 14
Period change     37 63 (211) 546
Balance, end of period $ 20,511   20,511   20,511  
Accumulated Other Comprehensive Gain (Loss)            
AOCI Attributable to Parent, Net of Tax [Roll Forward]            
Balance, beginning of period     (56) 227 192 (256)
Balance, end of period (19) $ 290 (19) 290 (19) 290
Unrealized gains and (losses) on debt securities | Debt Securities            
AOCI Attributable to Parent, Net of Tax [Roll Forward]            
Balance, beginning of period     (28) 145 188 (28)
Other comprehensive income before reclassifications     68 44 (155) 213
Amounts reclassified from accumulated OCI to earnings     10 18 17 22
Period change     78 62 (138) 235
Balance, end of period 50 207 50 207 50 207
Change in fair value related to cash flow hedges | Equity securities            
AOCI Attributable to Parent, Net of Tax [Roll Forward]            
Other comprehensive income before reclassifications         (73) 319
Amounts reclassified from accumulated OCI to earnings         0 0
Period change         (73) 319
Balance, end of period 184 342 184 342 184 342
Unrealized gains (losses) for pension and other post-retirement obligations            
AOCI Attributable to Parent, Net of Tax [Roll Forward]            
Balance, beginning of period     (251) (249) (253) (251)
Other comprehensive income before reclassifications     0 0 0 0
Amounts reclassified from accumulated OCI to earnings     4 (10) 6 (8)
Period change     4 (10) 6 (8)
Balance, end of period (247) (259) (247) (259) (247) (259)
Net unrealized gains (losses) on net investment hedges            
AOCI Attributable to Parent, Net of Tax [Roll Forward]            
Balance, beginning of period     223 331 257 23
Other comprehensive income before reclassifications     (39) 11    
Amounts reclassified from accumulated OCI to earnings     0 0    
Period change     (39) 11    
Balance, end of period 184 342 184 342 184 342
Accumulated Foreign Currency Adjustment Attributable to Parent            
AOCI Attributable to Parent, Net of Tax [Roll Forward]            
Balance, beginning of period     0 0 0 0
Other comprehensive income before reclassifications     (6) 0 (6) 0
Amounts reclassified from accumulated OCI to earnings     0 0 0 0
Period change     (6) 0 (6) 0
Balance, end of period (6) 0 $ (6) $ 0 $ (6) $ 0
Reclassification out of Accumulated Other Comprehensive Income            
AOCI Attributable to Parent, Net of Tax [Roll Forward]            
Net unrealized loss on securities transfer $ (48) $ (81)