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Accumulated Other Comprehensive Income (Changes In The Components Of AOCI) (Detail) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Beginning balance $ (61)  
Other comprehensive income (loss) before reclassification 69  
Amounts reclassified from AOCI (3)  
Total other comprehensive income (loss) 66 $ 1
Ending balance 5  
Unrealized gains (losses) on AFS, net [Member]    
Beginning balance (22)  
Other comprehensive income (loss) before reclassification 78  
Amounts reclassified from AOCI (3)  
Total other comprehensive income (loss) 75  
Ending balance 53  
Foreign currency translation, net [Member]    
Beginning balance (39)  
Other comprehensive income (loss) before reclassification (9)  
Amounts reclassified from AOCI 0  
Total other comprehensive income (loss) (9)  
Ending balance $ (48)