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Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Millions	Mar. 31, 2017	Dec. 31, 2016
Allowance for loans losses	$ 1,391	$ 1,433
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	1,125,000,000	1,125,000,000
Common stock, shares issued	439,000,000	436,000,000
Tax expense for accumulated other comprehensive income	$ 13	$ 3
Common stock held in treasury	154,000,000	145,000,000
FFELP Loans [Member]
Allowance for loans losses	$ 64	$ 67
Private Education Loans [Member]
Allowance for loans losses	$ 1,311	$ 1,351

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Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

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