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 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
AOCI Attributable to Parent, Net of Tax [Roll Forward]            
Balance, beginning of period         $ 12,993  
Other comprehensive income before reclassifications     $ (113) $ (40) (347) $ 492
Amounts reclassified from accumulated OCI to earnings     7 7 30 21
Period change     (106) (33) (317) 513
Balance, end of period $ 19,479   19,479   19,479  
Accumulated Other Comprehensive Gain (Loss)            
AOCI Attributable to Parent, Net of Tax [Roll Forward]            
Balance, beginning of period     (19) 290 192 (256)
Balance, end of period (125) $ 257 (125) 257 (125) 257
Unrealized gains and (losses) on debt securities | Debt Securities            
AOCI Attributable to Parent, Net of Tax [Roll Forward]            
Balance, beginning of period     50 207 188 (28)
Other comprehensive income before reclassifications     (86) 0 (241) 213
Amounts reclassified from accumulated OCI to earnings     4 5 21 27
Period change     (82) 5 (220) 240
Balance, end of period (32) 212 (32) 212 (32) 212
Net unrealized gains (losses) on net investment hedges            
AOCI Attributable to Parent, Net of Tax [Roll Forward]            
Balance, beginning of period     184 342 257 23
Other comprehensive income before reclassifications     (29) (40) (102) 279
Amounts reclassified from accumulated OCI to earnings     0 0 0 0
Period change     (29) (40) (102) 279
Balance, end of period 155 302 155 302 155 302
Translation adjustments, net of hedges            
AOCI Attributable to Parent, Net of Tax [Roll Forward]            
Balance, beginning of period     (6) 0 0 0
Other comprehensive income before reclassifications     2 0 (4) 0
Amounts reclassified from accumulated OCI to earnings     0 0 0 0
Period change     2 0 (4) 0
Balance, end of period (4) 0 (4) 0 (4) 0
Unrealized gains (losses) for pension and other post-retirement obligations            
AOCI Attributable to Parent, Net of Tax [Roll Forward]            
Balance, beginning of period     (247) (259) (253) (251)
Other comprehensive income before reclassifications     0 0 0 0
Amounts reclassified from accumulated OCI to earnings     3 2 9 (6)
Period change     3 2 9 (6)
Balance, end of period (244) (257) $ (244) $ (257) $ (244) $ (257)
Reclassification out of Accumulated Other Comprehensive Income            
AOCI Attributable to Parent, Net of Tax [Roll Forward]            
Net unrealized loss on securities transfer $ (41) $ (74)