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Accumulated Other Comprehensive Income (Changes In The Components Of AOCI) (Detail) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Beginning balance     $ 56  
Other comprehensive income before reclassification     (127)  
Amounts reclassified from AOCI     (15)  
Total other comprehensive income (loss) (95) 62 (142) 212
Ending balance (86)   (86)  
Unrealized gains (losses) on AFS, net [Member]
        
Beginning balance     43  
Other comprehensive income before reclassification     (88)  
Amounts reclassified from AOCI     (15)  
Total other comprehensive income (loss)     (103)  
Ending balance (60)   (60)  
Foreign currency translation, net [Member]
        
Beginning balance     13  
Other comprehensive income before reclassification     (39)  
Amounts reclassified from AOCI     0  
Total other comprehensive income (loss)     (39)  
Ending balance $ (26)   $ (26)