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Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Allowance for loans losses	$ 1,253	$ 1,377
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	1,125,000,000	1,125,000,000
Common stock, shares issued	458,000,000	454,000,000
Tax benefit for accumulated other comprehensive loss	$ 68	$ 90
Common stock held in treasury	290,000,000	267,000,000
FFELP Loans [Member]
Allowance for loans losses	$ 277	$ 288
Private Education Loans [Member]
Allowance for loans losses	$ 976	$ 1,089

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