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ALLOWANCE FOR CREDIT LOSSES - Schedule of Allowance for Credit Losses for HTM Debt Securities (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Roll Forward]      
Allowance for credit losses on HTM debt securities at beginning of year $ 87 $ 86 $ 0
Gross credit losses 0 0 0
Gross recoveries 0 3 0
Net credit losses (NCLs) 0 3 0
Net reserve builds (releases) 33 4 7
Net specific reserve builds (releases) 0 (4) 0
Total provision for credit losses on HTM debt securities 33 (3) 7
Other, net 0 1 9
Allowance for credit losses on HTM debt securities at end of year 120 87 86
Cumulative effect of adoption      
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Roll Forward]      
Allowance for credit losses on HTM debt securities at beginning of year     70
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 year 6 3 0
Gross credit losses 0 0 0
Gross recoveries 0 3 0
Net credit losses (NCLs) 0 3 0
Net reserve builds (releases) (5) 7 (2)
Net specific reserve builds (releases) 0 (4) 0
Total provision for credit losses on HTM debt securities (5) 0 (2)
Other, net 0 0 5
Allowance for credit losses on HTM debt securities at end of year 1 6 3
Mortgage-backed securities | Cumulative effect of adoption      
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Roll Forward]      
Allowance for credit losses on HTM debt securities at beginning of year     0
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 year 75 74 0
Gross credit losses 0 0 0
Gross recoveries 0 0 0
Net credit losses (NCLs) 0 0 0
Net reserve builds (releases) 37 1 10
Net specific reserve builds (releases) 0 0 0
Total provision for credit losses on HTM debt securities 37 1 10
Other, net 1 0 3
Allowance for credit losses on HTM debt securities at end of year 113 75 74
State and municipal | Cumulative effect of adoption      
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Roll Forward]      
Allowance for credit losses on HTM debt securities at beginning of year     61
Foreign government      
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Roll Forward]      
Allowance for credit losses on HTM debt securities at beginning of year 4 6 0
Gross credit losses 0 0 0
Gross recoveries 0 0 0
Net credit losses (NCLs) 0 0 0
Net reserve builds (releases) 0 (2) (2)
Net specific reserve builds (releases) 0 0 0
Total provision for credit losses on HTM debt securities 0 (2) (2)
Other, net (1) 0 4
Allowance for credit losses on HTM debt securities at end of year 3 4 6
Foreign government | Cumulative effect of adoption      
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Roll Forward]      
Allowance for credit losses on HTM debt securities at beginning of year     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 year 2 3 0
Gross credit losses 0 0 0
Gross recoveries 0 0 0
Net credit losses (NCLs) 0 0 0
Net reserve builds (releases) 1 (2) 1
Net specific reserve builds (releases) 0 0 0
Total provision for credit losses on HTM debt securities 1 (2) 1
Other, net 0 1 (3)
Allowance for credit losses on HTM debt securities at end of year 3 2 3
Asset-backed | Cumulative effect of adoption      
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Roll Forward]      
Allowance for credit losses on HTM debt securities at beginning of year     5
All other debt securities      
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Roll Forward]      
Allowance for credit losses on HTM debt securities at beginning of year 0 0 0
Gross credit losses 0 0 0
Gross recoveries 0 0 0
Net credit losses (NCLs) 0 0 0
Net reserve builds (releases) 0 0 0
Net specific reserve builds (releases) 0 0 0
Total provision for credit losses on HTM debt securities 0 0 0
Other, net 0 0 0
Allowance for credit losses on HTM debt securities at end of year $ 0 $ 0 0
All other debt securities | Cumulative effect of adoption      
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Roll Forward]      
Allowance for credit losses on HTM debt securities at beginning of year     $ 0