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CONSOLIDATED BALANCE SHEETS (UNAUDITED) (Parenthetical) - USD ($)
$ in Millions
Mar. 31, 2021
Dec. 31, 2020
ASSETS:    
Securities held-to-maturity, fair value $ 3,077 $ 3,357
STOCKHOLDERS’ EQUITY:    
Preferred stock, par value (in dollars per share) $ 25 $ 25.00
Preferred stock, authorized (in shares) 100,000,000 100,000,000
Preferred stock, issued (in shares) 2,000,000 2,000,000
Preferred stock, outstanding (in shares)   2,000,000
Common stock, par value (in dollars per share) $ 0.01 $ 0.01
Common stock, authorized (in shares) 1,000,000,000 1,000,000,000
Common stock, issued (in shares) 570,841,385 569,876,133
Common stock, outstanding (in shares) 425,930,159 427,209,831
Treasury stock (in shares) 144,911,226 142,666,302
Available-for-sale Securities    
ASSETS:    
Securities, pledged to creditors $ 539 $ 549
Held-to-maturity Securities    
ASSETS:    
Securities, pledged to creditors 141 144
Securities held-to-maturity, fair value $ 3,077 $ 3,357