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Consolidated Statements of Comprehensive Income (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Statement Of Income And Comprehensive Income [Abstract]      
Net income $ 1,417 $ 937 $ 632
Other comprehensive income (loss):      
Unrealized hedging gains (losses) on derivatives 27 (11) (6)
Reclassification adjustments for derivative losses included in net income (interest expense) 9 25 55
Total unrealized gains (losses) on derivatives 36 14 49
Unrealized gains (losses) on investments (6) (1) 2
Defined benefit pension plans adjustment     (3)
Income tax expense (11) (5) (17)
Other comprehensive income, net of tax 19 8 31
Comprehensive income 1,436 945 663
Less: comprehensive loss attributable to noncontrolling interest (1) (2) (1)
Total comprehensive income attributable to SLM Corporation $ 1,437 $ 947 $ 664