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Fair Value Measurements (Details 2) (USD $)
In Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2011
Jun. 30, 2010
Jun. 20, 2011
Dec. 31, 2010
Change in balance sheet carrying value associated with Level 3 financial instruments carried at fair value on a recurring basis            
Balance, beginning of period $ 1,952 $ 1,197 $ 1,363 $ 3,080    
Total gains/(losses) (realized and unrealized):            
Included in earnings 360 (910) 1,023 (1,792)    
Included in other comprehensive income            
Settlements (116) (35) (190) (25)    
Cumulative effect of accounting change       (1,011)    
Transfers in and/or out of Level 3            
Balance, end of period 2,196 252 2,196 252    
Change in unrealized gains/(losses) relating to instruments still held at the reporting date 281 (952) 867 (1,880)    
Included in earnings            
Gains (losses) on derivative and hedging activities, net 303 (948) 916 (1,876)    
Interest expense 57 38 107 84    
Total 360 (910) 1,023 (1,792)    
Fair Value Measurements (Textuals) [Abstract]            
Available-for-sale investments, cost basis         113 137
Available-for-sale investments, fair value 117   117     139
Interest rate swaps [Member] | Difference [Member]
            
Fair values of financial assets and liabilities, including derivative financial instruments            
Derivative financial instruments 0   0     0
Floor Income Contracts [Member] | Difference [Member]
            
Fair values of financial assets and liabilities, including derivative financial instruments            
Derivative financial instruments 0   0     0
Cross currency interest rate swaps [Member] | Difference [Member]
            
Fair values of financial assets and liabilities, including derivative financial instruments            
Derivative financial instruments 0   0     0
Difference [Member]
            
Fair values of financial assets and liabilities, including derivative financial instruments            
Total earning assets (5,109)   (5,109)     (6,375)
Total interest-bearing liabilities 8,940   8,940     9,201
Excess of net asset fair value over carrying value 3,831   3,831     2,826
Difference [Member] | FFELP Loans [Member]
            
Fair values of financial assets and liabilities, including derivative financial instruments            
Total earning assets (2,294)   (2,294)     (1,486)
Difference [Member] | Long-term borrowings [Member]
            
Fair values of financial assets and liabilities, including derivative financial instruments            
Total interest-bearing liabilities 8,922   8,922     9,189
Difference [Member] | Short-term borrowings [Member]
            
Fair values of financial assets and liabilities, including derivative financial instruments            
Total interest-bearing liabilities 18   18     12
Difference [Member] | Cash and investments [Member]
            
Fair values of financial assets and liabilities, including derivative financial instruments            
Total earning assets 0   0     0
Difference [Member] | Other loans [Member]
            
Fair values of financial assets and liabilities, including derivative financial instruments            
Total earning assets (148)   (148)     (182)
Difference [Member] | Private Education Loans [Member]
            
Fair values of financial assets and liabilities, including derivative financial instruments            
Total earning assets (2,667)   (2,667)     (4,707)
Difference [Member] | Futures contracts [Member]
            
Fair values of financial assets and liabilities, including derivative financial instruments            
Derivative financial instruments 0   0     0
Interest rate swaps [Member] | Carrying Value [Member]
            
Fair values of financial assets and liabilities, including derivative financial instruments            
Derivative financial instruments 796   796     744
Floor Income Contracts [Member] | Carrying Value [Member]
            
Fair values of financial assets and liabilities, including derivative financial instruments            
Derivative financial instruments (2,390)   (2,390)     (1,315)
Cross currency interest rate swaps [Member] | Carrying Value [Member]
            
Fair values of financial assets and liabilities, including derivative financial instruments            
Derivative financial instruments 2,683   2,683     1,811
Carrying Value [Member]
            
Fair values of financial assets and liabilities, including derivative financial instruments            
Total earning assets 189,979   189,979     196,128
Total interest-bearing liabilities 191,531   191,531     197,160
Carrying Value [Member] | FFELP Loans [Member]
            
Fair values of financial assets and liabilities, including derivative financial instruments            
Total earning assets 142,635   142,635     148,649
Carrying Value [Member] | Long-term borrowings [Member]
            
Fair values of financial assets and liabilities, including derivative financial instruments            
Total interest-bearing liabilities 160,765   160,765     163,544
Carrying Value [Member] | Short-term borrowings [Member]
            
Fair values of financial assets and liabilities, including derivative financial instruments            
Total interest-bearing liabilities 30,766   30,766     33,616
Carrying Value [Member] | Cash and investments [Member]
            
Fair values of financial assets and liabilities, including derivative financial instruments            
Total earning assets 11,359   11,359     11,553
Carrying Value [Member] | Other loans [Member]
            
Fair values of financial assets and liabilities, including derivative financial instruments            
Total earning assets 232   232     270
Carrying Value [Member] | Private Education Loans [Member]
            
Fair values of financial assets and liabilities, including derivative financial instruments            
Total earning assets 35,753   35,753     35,656
Carrying Value [Member] | Futures contracts [Member]
            
Fair values of financial assets and liabilities, including derivative financial instruments            
Derivative financial instruments 3   3     25
Interest rate swaps [Member] | Fair Value [Member]
            
Fair values of financial assets and liabilities, including derivative financial instruments            
Derivative financial instruments 796   796     744
Floor Income Contracts [Member] | Fair Value [Member]
            
Fair values of financial assets and liabilities, including derivative financial instruments            
Derivative financial instruments (2,390)   (2,390)     (1,315)
Cross currency interest rate swaps [Member] | Fair Value [Member]
            
Fair values of financial assets and liabilities, including derivative financial instruments            
Derivative financial instruments 2,683   2,683     1,811
Fair Value [Member]
            
Fair values of financial assets and liabilities, including derivative financial instruments            
Total earning assets 184,870   184,870     189,753
Total interest-bearing liabilities 182,591   182,591     187,959
Fair Value [Member] | FFELP Loans [Member]
            
Fair values of financial assets and liabilities, including derivative financial instruments            
Total earning assets 140,341   140,341     147,163
Fair Value [Member] | Long-term borrowings [Member]
            
Fair values of financial assets and liabilities, including derivative financial instruments            
Total interest-bearing liabilities 151,843   151,843     154,355
Fair Value [Member] | Short-term borrowings [Member]
            
Fair values of financial assets and liabilities, including derivative financial instruments            
Total interest-bearing liabilities 30,748   30,748     33,604
Fair Value [Member] | Cash and investments [Member]
            
Fair values of financial assets and liabilities, including derivative financial instruments            
Total earning assets 11,359   11,359     11,553
Fair Value [Member] | Other loans [Member]
            
Fair values of financial assets and liabilities, including derivative financial instruments            
Total earning assets 84   84     88
Fair Value [Member] | Private Education Loans [Member]
            
Fair values of financial assets and liabilities, including derivative financial instruments            
Total earning assets 33,086   33,086     30,949
Fair Value [Member] | Futures contracts [Member]
            
Fair values of financial assets and liabilities, including derivative financial instruments            
Derivative financial instruments 3   3     25
Total Derivative Instruments [Member]
            
Change in balance sheet carrying value associated with Level 3 financial instruments carried at fair value on a recurring basis            
Balance, beginning of period       1,252    
Total gains/(losses) (realized and unrealized):            
Included in earnings       (1,792)    
Settlements       (25)    
Cumulative effect of accounting change       817    
Balance, end of period   252   252    
Change in unrealized gains/(losses) relating to instruments still held at the reporting date       (1,880)    
Floor Income Contracts [Member]
            
Change in balance sheet carrying value associated with Level 3 financial instruments carried at fair value on a recurring basis            
Balance, beginning of period       (54)    
Total gains/(losses) (realized and unrealized):            
Included in earnings       3    
Settlements       51    
Balance, end of period   0   0    
Interest rate swaps [Member]
            
Change in balance sheet carrying value associated with Level 3 financial instruments carried at fair value on a recurring basis            
Balance, beginning of period (85) (329) (90) (272)    
Total gains/(losses) (realized and unrealized):            
Included in earnings 6 165 34 160    
Settlements (1) 2 (24) 6    
Cumulative effect of accounting change       (56)    
Balance, end of period (80) (162) (80) (162)    
Change in unrealized gains/(losses) relating to instruments still held at the reporting date 5 161 10 161    
Cross currency interest rate swaps [Member]
            
Change in balance sheet carrying value associated with Level 3 financial instruments carried at fair value on a recurring basis            
Balance, beginning of period 2,011 1,548 1,427 1,596    
Total gains/(losses) (realized and unrealized):            
Included in earnings 321 (1,086) 954 (1,959)    
Settlements (59) (39) (108) (87)    
Cumulative effect of accounting change       873    
Balance, end of period 2,273 423 2,273 423    
Change in unrealized gains/(losses) relating to instruments still held at the reporting date 262 (1,125) 844 (2,047)    
Residual Interests [Member]
            
Change in balance sheet carrying value associated with Level 3 financial instruments carried at fair value on a recurring basis            
Balance, beginning of period       1,828    
Total gains/(losses) (realized and unrealized):            
Cumulative effect of accounting change       (1,828)    
Balance, end of period   0   0    
Other [Member]
            
Change in balance sheet carrying value associated with Level 3 financial instruments carried at fair value on a recurring basis            
Balance, beginning of period 26 (22) 26 (18)    
Total gains/(losses) (realized and unrealized):            
Included in earnings 33 11 35 4    
Settlements (56) 2 (58) 5    
Balance, end of period 3 (9) 3 (9)    
Change in unrealized gains/(losses) relating to instruments still held at the reporting date 14 12 13 6    
Fair Value Measurements (Textuals) [Abstract]            
Available-for-sale investments, fair value $ 12   $ 12     $ 12