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Variable Interest Entities (Narrative) (Detail)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2020
Jun. 30, 2019
USD ($)
Mar. 31, 2019
USD ($)
Dec. 31, 2019
USD ($)
Jun. 30, 2020
USD ($)
Variable Interest Entity [Line Items]          
Carrying amounts of assets       $ 7,284 $ 6,613
Carrying amounts of liabilities       6,445 6,253
Additional Voluntary Payment       66  
Variable Interest Entity Primary Beneficiary [Member]          
Variable Interest Entity [Line Items]          
Carrying amounts of assets       1,600 1,300
Carrying amounts of liabilities       $ 1,500 $ 1,200
Variable Interest Entity Primary Beneficiary [Member] | U S Public Finance Insurance [Member]          
Variable Interest Entity [Line Items]          
Number of variable interest entities deconsolidated 7        
Number of variable interest entities consolidated     7    
Net realized gains (losses) related to the initial consolidation     $ (42)    
Variable Interest Entity Primary Beneficiary [Member] | Structured Finance And International Insurance [Member]          
Variable Interest Entity [Line Items]          
Number of variable interest entities deconsolidated 1 2      
Deconsolidation, Gain (Loss), Amount   $ (16)