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SECURITIES - Fair Values and Unrealized Losses of Impaired Securities, by Length of Impairment (Details)
$ in Millions
Jun. 30, 2023
USD ($)
security
Dec. 31, 2022
USD ($)
security
Schedule Of Securities [Line Items]    
Debt securities, available-for-sale, less than 12 months, number of positions | security 33 198
Debt securities, available-for-sale, 12 months or longer, number of positions | security 238 67
Debt securities, available-for-sale, number of positions | security 271 265
Debt securities, available-for-sale, less than 12 months $ 418 $ 1,868
Debt securities, available-for-sale, 12 months or longer 2,653 1,343
Debt securities, available-for-sale, unrealized loss position 3,071 3,211
Debt securities, available-for-sale, less than 12 months, accumulated loss (14) (138)
Debt securities, available-for-sale, 12 months or longer, accumulated loss (329) (210)
Debt securities, available-for-sale, accumulated loss $ (343) $ (348)
U.S. Treasury    
Schedule Of Securities [Line Items]    
Debt securities, available-for-sale, less than 12 months, number of positions | security 1 3
Debt securities, available-for-sale, 12 months or longer, number of positions | security 5 3
Debt securities, available-for-sale, number of positions | security 6 6
Debt securities, available-for-sale, less than 12 months $ 24 $ 120
Debt securities, available-for-sale, 12 months or longer 233 137
Debt securities, available-for-sale, unrealized loss position 257 257
Debt securities, available-for-sale, less than 12 months, accumulated loss (1) (7)
Debt securities, available-for-sale, 12 months or longer, accumulated loss (20) (14)
Debt securities, available-for-sale, accumulated loss $ (21) $ (21)
U.S. government agencies    
Schedule Of Securities [Line Items]    
Debt securities, available-for-sale, less than 12 months, number of positions | security 6 6
Debt securities, available-for-sale, 12 months or longer, number of positions | security 8 8
Debt securities, available-for-sale, number of positions | security 14 14
Debt securities, available-for-sale, less than 12 months $ 34 $ 46
Debt securities, available-for-sale, 12 months or longer 9 4
Debt securities, available-for-sale, unrealized loss position 43 50
Debt securities, available-for-sale, less than 12 months, accumulated loss 0 0
Debt securities, available-for-sale, 12 months or longer, accumulated loss 0 0
Debt securities, available-for-sale, accumulated loss $ 0 $ 0
U.S. government-sponsored entities    
Schedule Of Securities [Line Items]    
Debt securities, available-for-sale, less than 12 months, number of positions | security 1 9
Debt securities, available-for-sale, 12 months or longer, number of positions | security 10 4
Debt securities, available-for-sale, number of positions | security 11 13
Debt securities, available-for-sale, less than 12 months $ 22 $ 150
Debt securities, available-for-sale, 12 months or longer 232 112
Debt securities, available-for-sale, unrealized loss position 254 262
Debt securities, available-for-sale, less than 12 months, accumulated loss (1) (8)
Debt securities, available-for-sale, 12 months or longer, accumulated loss (20) (13)
Debt securities, available-for-sale, accumulated loss $ (21) $ (21)
Agency mortgage-backed securities    
Schedule Of Securities [Line Items]    
Debt securities, available-for-sale, less than 12 months, number of positions | security 14 104
Debt securities, available-for-sale, 12 months or longer, number of positions | security 109 13
Debt securities, available-for-sale, number of positions | security 123 117
Debt securities, available-for-sale, less than 12 months $ 108 $ 773
Debt securities, available-for-sale, 12 months or longer 1,004 455
Debt securities, available-for-sale, unrealized loss position 1,112 1,228
Debt securities, available-for-sale, less than 12 months, accumulated loss (5) (58)
Debt securities, available-for-sale, 12 months or longer, accumulated loss (118) (70)
Debt securities, available-for-sale, accumulated loss $ (123) $ (128)
Agency collateralized mortgage obligations    
Schedule Of Securities [Line Items]    
Debt securities, available-for-sale, less than 12 months, number of positions | security 1 49
Debt securities, available-for-sale, 12 months or longer, number of positions | security 70 23
Debt securities, available-for-sale, number of positions | security 71 72
Debt securities, available-for-sale, less than 12 months $ 20 $ 455
Debt securities, available-for-sale, 12 months or longer 872 517
Debt securities, available-for-sale, unrealized loss position 892 972
Debt securities, available-for-sale, less than 12 months, accumulated loss (1) (42)
Debt securities, available-for-sale, 12 months or longer, accumulated loss (135) (96)
Debt securities, available-for-sale, accumulated loss $ (136) $ (138)
Commercial mortgage-backed securities    
Schedule Of Securities [Line Items]    
Debt securities, available-for-sale, less than 12 months, number of positions | security 6 16
Debt securities, available-for-sale, 12 months or longer, number of positions | security 17 5
Debt securities, available-for-sale, number of positions | security 23 21
Debt securities, available-for-sale, less than 12 months $ 197 $ 302
Debt securities, available-for-sale, 12 months or longer 263 94
Debt securities, available-for-sale, unrealized loss position 460 396
Debt securities, available-for-sale, less than 12 months, accumulated loss (5) (21)
Debt securities, available-for-sale, 12 months or longer, accumulated loss (32) (14)
Debt securities, available-for-sale, accumulated loss $ (37) $ (35)
States of the U.S. and political subdivisions (municipals)    
Schedule Of Securities [Line Items]    
Debt securities, available-for-sale, less than 12 months, number of positions | security 1 4
Debt securities, available-for-sale, 12 months or longer, number of positions | security 13 10
Debt securities, available-for-sale, number of positions | security 14 14
Debt securities, available-for-sale, less than 12 months $ 1 $ 7
Debt securities, available-for-sale, 12 months or longer 28 22
Debt securities, available-for-sale, unrealized loss position 29 29
Debt securities, available-for-sale, less than 12 months, accumulated loss 0 (1)
Debt securities, available-for-sale, 12 months or longer, accumulated loss (3) (3)
Debt securities, available-for-sale, accumulated loss $ (3) $ (4)
Other debt securities    
Schedule Of Securities [Line Items]    
Debt securities, available-for-sale, less than 12 months, number of positions | security 3 7
Debt securities, available-for-sale, 12 months or longer, number of positions | security 6 1
Debt securities, available-for-sale, number of positions | security 9 8
Debt securities, available-for-sale, less than 12 months $ 12 $ 15
Debt securities, available-for-sale, 12 months or longer 12 2
Debt securities, available-for-sale, unrealized loss position 24 17
Debt securities, available-for-sale, less than 12 months, accumulated loss (1) (1)
Debt securities, available-for-sale, 12 months or longer, accumulated loss (1) 0
Debt securities, available-for-sale, accumulated loss $ (2) $ (1)