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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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