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ALLOWANCE FOR CREDIT LOSSES - Schedule of Allowance for Credit Losses for HTM Debt Securities (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Roll Forward]        
Allowance for credit losses on HTM debt securities at beginning of quarter $ 105 $ 83 $ 87 $ 86
Gross credit losses 0 0 0 0
Gross recoveries 0 0 0 3
Net credit losses (NCLs) 0 0 0 3
Net reserve builds (releases) 10 (6) 28 (10)
Net specific reserve builds (releases) 0 (4) 0 (4)
Total provision for credit losses on HTM debt securities 10 (10) 28 (17)
Other, net   0   1
Allowance for credit losses on HTM debt securities at end of quarter 115 73 115 73
Mortgage-backed securities        
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Roll Forward]        
Allowance for credit losses on HTM debt securities at beginning of quarter 2 5 6 3
Gross credit losses 0 0 0 0
Gross recoveries 0 0 0 3
Net credit losses (NCLs) 0 0 0 3
Net reserve builds (releases) 1 0 (3) 2
Net specific reserve builds (releases) 0 (4) 0 (4)
Total provision for credit losses on HTM debt securities 1 (4) (3) (5)
Other, net   0   0
Allowance for credit losses on HTM debt securities at end of quarter 3 1 3 1
State and municipal        
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Roll Forward]        
Allowance for credit losses on HTM debt securities at beginning of quarter 94 72 76 74
Gross credit losses 0 0 0 0
Gross recoveries 0 0 0 0
Net credit losses (NCLs) 0 0 0 0
Net reserve builds (releases) 15 (5) 33 (7)
Net specific reserve builds (releases) 0 0 0 0
Total provision for credit losses on HTM debt securities 15 (5) 33 (7)
Other, net   0   0
Allowance for credit losses on HTM debt securities at end of quarter 109 67 109 67
Foreign government        
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Roll Forward]        
Allowance for credit losses on HTM debt securities at beginning of quarter 3 5 3 6
Gross credit losses 0 0 0 0
Gross recoveries 0 0 0 0
Net credit losses (NCLs) 0 0 0 0
Net reserve builds (releases) 0 (1) 0 (2)
Net specific reserve builds (releases) 0 0 0 0
Total provision for credit losses on HTM debt securities 0 (1) 0 (2)
Other, net   0   0
Allowance for credit losses on HTM debt securities at end of quarter 3 4 3 4
Asset-backed        
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Roll Forward]        
Allowance for credit losses on HTM debt securities at beginning of quarter 6 1 2 3
Gross credit losses 0 0 0 0
Gross recoveries 0 0 0 0
Net credit losses (NCLs) 0 0 0 0
Net reserve builds (releases) (6) 0 (2) (3)
Net specific reserve builds (releases) 0 0 0 0
Total provision for credit losses on HTM debt securities (6) 0 (2) (3)
Other, net   0   1
Allowance for credit losses on HTM debt securities at end of quarter $ 0 $ 1 $ 0 $ 1