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Accumulated Other Comprehensive Income (Changes In The Components Of AOCI) (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Beginning balance $ (19) $ (128) $ (61)
Other comprehensive income (loss) before reclassification 30 101 [1] (68)
Amounts reclassified from AOCI 0 8 1
Total other comprehensive income (loss) 30 109 (67)
Ending balance (156) (19) (128)
ASU 2018-02 [Member]      
Cumulative effect of prospective application of new accounting principle 3    
Unrealized gains (losses) on AFS, net [Member]      
Beginning balance (10) 6 (22)
Other comprehensive income (loss) before reclassification (24) (24) 27
Amounts reclassified from AOCI 0 8 1
Total other comprehensive income (loss) (24) (16) 28
Ending balance (39) (10) 6
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) (134) (39)
Other comprehensive income (loss) before reclassification 2 125 (95)
Amounts reclassified from AOCI 0 0 0
Total other comprehensive income (loss) 2 125 (95)
Ending balance (7) (9) (134)
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 0 0
Other comprehensive income (loss) before reclassification 52 0 0
Amounts reclassified from AOCI 0 0 0
Total other comprehensive income (loss) 52 0 0
Ending balance (110) 0 0
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) 30 $ 109 $ (67)
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)    
[1]
Includes items included in the Company's loss calculation to adjust the carrying value of MBIA UK to its fair value less costs to sell for the year ended December 31, 2016. The sale was completed in January of 2017 and as such, these amounts included in AOCI were reversed and included in the Sale Transaction.