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Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($)
$ in Millions
Sep. 30, 2022
Dec. 31, 2021
Allowance for loans losses $ 1,085 $ 1,271
Common stock, par value $ 0.01 $ 0.01
Common stock, shares authorized 1,125,000,000 1,125,000,000
Common stock, shares issued 461,000,000 459,000,000
Tax expense (benefit) for accumulated other comprehensive income (loss) $ 28 $ (45)
Common stock held in treasury 325,000,000 305,000,000
Series A Junior Participate [Member]    
Preferred stock, par value   $ 0.20
Preferred stock shares authorized   2,000,000
Preferred stock shares issued   0
Preferred stock shares outstanding   0
FFELP Loans [Member]    
Allowance for loans losses $ 233 $ 262
Private Education Loans [Member]    
Allowance for loans losses $ 852 $ 1,009