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Accumulated Other Comprehensive Income (Changes In The Components Of AOCI) (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Beginning balance     $ (19)  
Other comprehensive income (loss) before reclassification     (69)  
Amounts reclassified from AOCI     0  
Total other comprehensive income (loss) $ (14) $ (8) (69) $ 89
Ending balance (255)   (255)  
ASU 2018-02 [Member]        
Cumulative effect of prospective application of new accounting principle     3  
Unrealized gains (losses) on AFS, net [Member]        
Beginning balance     (10)  
Other comprehensive income (loss) before reclassification     (39)  
Amounts reclassified from AOCI     0  
Total other comprehensive income (loss)     (39)  
Ending balance (54)   (54)  
Unrealized gains (losses) on AFS, net [Member] | ASU 2016-01 [Member]        
Cumulative effect of prospective application of new accounting principle     (2)  
Unrealized gains (losses) on AFS, net [Member] | ASU 2018-02 [Member]        
Cumulative effect of prospective application of new accounting principle     (3)  
Foreign currency translation, net [Member]        
Beginning balance     (9)  
Other comprehensive income (loss) before reclassification     2  
Amounts reclassified from AOCI     0  
Total other comprehensive income (loss)     2  
Ending balance (7)   (7)  
Foreign currency translation, net [Member] | ASU 2016-01 [Member]        
Cumulative effect of prospective application of new accounting principle     0  
Foreign currency translation, net [Member] | ASU 2018-02 [Member]        
Cumulative effect of prospective application of new accounting principle     0  
Instrument-specific credit risk of liabilities measured at fair value, net [Member]        
Beginning balance     0  
Other comprehensive income (loss) before reclassification     (32)  
Amounts reclassified from AOCI     0  
Total other comprehensive income (loss)     (32)  
Ending balance $ (194)   (194)  
Instrument-specific credit risk of liabilities measured at fair value, net [Member] | ASU 2016-01 [Member]        
Cumulative effect of prospective application of new accounting principle     (162)  
Instrument-specific credit risk of liabilities measured at fair value, net [Member] | ASU 2018-02 [Member]        
Cumulative effect of prospective application of new accounting principle     0  
Accumulated Other Comprehensive Income [Member]        
Total other comprehensive income (loss)     (69)  
Accumulated Other Comprehensive Income [Member] | ASU 2016-01 [Member]        
Cumulative effect of prospective application of new accounting principle     (164)  
Accumulated Other Comprehensive Income [Member] | ASU 2018-02 [Member]        
Cumulative effect of prospective application of new accounting principle     $ (3)