Quarterly report pursuant to Section 13 or 15(d)

INVESTMENT SECURITIES AND OTHER SECURITIES - Continuous Unrealized Loss Position (Details)

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INVESTMENT SECURITIES AND OTHER SECURITIES - Continuous Unrealized Loss Position (Details) - USD ($)
$ in Millions
Mar. 31, 2021
Dec. 31, 2020
Available-for-sale securities:    
Less than 12 months, fair value $ 10,137 $ 2,432
Less than 12 months, gross unrealized losses (235) (22)
12 months or longer, fair value 463 490
12 months or longer, gross unrealized losses (12) (12)
Total, fair value 10,600 2,922
Total, gross unrealized losses (247) (34)
Held-to-maturity securities:    
Less than 12 months, fair value 1,235  
Less than 12 months, gross unrealized losses (18)  
12 months or longer, fair value 0  
12 months or longer, gross unrealized losses 0  
Total, fair value 1,235  
Total, gross unrealized losses 18  
Residential CMO    
Available-for-sale securities:    
Less than 12 months, fair value 413 302
Less than 12 months, gross unrealized losses (9) (5)
12 months or longer, fair value 0 0
12 months or longer, gross unrealized losses 0 0
Total, fair value 413 302
Total, gross unrealized losses (9) (5)
Residential MBS    
Available-for-sale securities:    
Less than 12 months, fair value 7,919 1,633
Less than 12 months, gross unrealized losses (124) (5)
12 months or longer, fair value 0 0
12 months or longer, gross unrealized losses 0 0
Total, fair value 7,919 1,633
Total, gross unrealized losses (124) (5)
Held-to-maturity securities:    
Less than 12 months, fair value 1,235  
Less than 12 months, gross unrealized losses (18)  
12 months or longer, fair value 0  
12 months or longer, gross unrealized losses 0  
Total, fair value 1,235  
Total, gross unrealized losses 18  
Commercial MBS    
Available-for-sale securities:    
Less than 12 months, fair value 761 321
Less than 12 months, gross unrealized losses (63) (9)
12 months or longer, fair value 0 0
12 months or longer, gross unrealized losses 0 0
Total, fair value 761 321
Total, gross unrealized losses (63) (9)
Total U.S. Treasury, federal agency and other agency securities    
Available-for-sale securities:    
Less than 12 months, fair value 9,093 2,256
Less than 12 months, gross unrealized losses (196) (19)
12 months or longer, fair value 0 0
12 months or longer, gross unrealized losses 0 0
Total, fair value 9,093 2,256
Total, gross unrealized losses (196) (19)
Municipal securities    
Available-for-sale securities:    
Less than 12 months, fair value 163 110
Less than 12 months, gross unrealized losses (7) (3)
12 months or longer, fair value 463 490
12 months or longer, gross unrealized losses (12) (12)
Total, fair value 626 600
Total, gross unrealized losses (19) (15)
Asset-backed securities    
Available-for-sale securities:    
Less than 12 months, fair value 65 15
Less than 12 months, gross unrealized losses (1) 0
12 months or longer, fair value 0 0
12 months or longer, gross unrealized losses 0 0
Total, fair value 65 15
Total, gross unrealized losses (1) 0
Corporate debt    
Available-for-sale securities:    
Less than 12 months, fair value 816 51
Less than 12 months, gross unrealized losses (31) 0
12 months or longer, fair value 0 0
12 months or longer, gross unrealized losses 0 0
Total, fair value 816 51
Total, gross unrealized losses $ (31) $ 0