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Business Developments And Risks And Uncertainties (Narrative) (Detail)
$ in Millions
9 Months Ended
Oct. 31, 2021
USD ($)
Oct. 21, 2021
USD ($)
Oct. 18, 2021
Feb. 10, 2021
USD ($)
Sep. 30, 2021
USD ($)
segments
Business Acquisition [Line Items]          
Number of operating segments | segments         3
Federal legislation passed to combat the economic impact         $ 2,700,000
New relief plan proposed to stabilize the financial system         1,900,000
Aid allocated to state and local governments         350,000
Percentage of voters voted by the deadline     27.00%    
Puerto Rico GO exposure [Member]          
Business Acquisition [Line Items]          
Percentage of voters voted by the deadline     27.00%    
Credit Suisse [Member]          
Business Acquisition [Line Items]          
Damages Paid Value       $ 600  
Damages Sought Value         604
Subsequent Event [Member] | Puerto Rico Electric Power Authority [Member]          
Business Acquisition [Line Items]          
Bankruptcy claims sold   $ 199      
Percentage rate of claim which reduces potential volatility and ongoing risk 16.00%        
Additional Bankruptcy claims demanded $ 230        
GFL Medium Term Notes [Member]          
Business Acquisition [Line Items]          
Debt instrument, Repurchase amount         $ 106
Percentage of weighted average cost of notes repurchased         72.00%
Puerto Rico [Member]          
Business Acquisition [Line Items]          
Claims payments         $ 277
Outstanding bonds         $ 2,600
MBIA Corp Financing Facility [Member]          
Business Acquisition [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage         12.00%
Debt Instrument, Maturity Date         Jan. 20, 2022