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Accumulated Other Comprehensive Income (Changes In The Components Of AOCI) (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Beginning balance     $ (86)  
Other comprehensive income (loss) before reclassification     54  
Amounts reclassified from AOCI     18  
Total other comprehensive income (loss) (70) 36 72 (106)
Ending balance (14)   (14)  
Unrealized gains (losses) on AFS, net [Member]
       
Beginning balance     (96)  
Other comprehensive income (loss) before reclassification     70  
Amounts reclassified from AOCI     14  
Total other comprehensive income (loss)     84  
Ending balance (12)   (12)  
Foreign currency translation, net [Member]
       
Beginning balance     10  
Other comprehensive income (loss) before reclassification     (16)  
Amounts reclassified from AOCI     4  
Total other comprehensive income (loss)     (12)  
Ending balance $ (2)   $ (2)