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Debt (Narrative) (Details) - USD ($)
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Jun. 30, 2006
Debt Instrument [Line Items]        
Debt Issuance Cost $ 28,000,000 $ 24,000,000    
Undrawn Outstanding Letters Of Credit In Favor Of Third Parties 53,000,000 23,000,000    
Undrawn Outstanding Letters Of Credit Between Subsidiaries 1,440,000,000 $ 1,508,000,000    
Debt Instrument, Face Amount       $ 850,000,000
Line of Credit Facility, Maximum Borrowing Capacity $ 988,000,000      
Debt, Weighted Average Interest Rate 4.42% 4.54%    
Long-term Debt, Gross $ 3,695,000,000 $ 3,597,000,000    
Long-term debt 3,667,000,000 3,573,000,000    
Long-term Debt, Maturities, Repayments of Principal in Year Four 4,000,000      
Line of Credit Facility, Commitment Fee Amount $ 11,000,000 10,000,000 $ 8,000,000  
Senior Notes Due 2026 [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Interest Rate, Stated Percentage 3.95%      
Debt Instrument, Face Amount $ 400,000,000      
Long-term Debt, Gross $ 400,000,000 400,000,000    
Subordinated Debentures Due 2056 [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Interest Rate, Stated Percentage 5.75%      
Debt Instrument, Face Amount $ 400,000,000      
Long-term Debt, Gross $ 400,000,000 400,000,000    
Junior Subordinated Debentures Due 2065 [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Interest Rate, Stated Percentage 4.82%      
Debt Instrument, Face Amount $ 400,000,000      
Long-term Debt, Gross $ 319,000,000 319,000,000    
Senior Notes Due 2021 [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Interest Rate, Stated Percentage 5.00%      
Debt Instrument, Face Amount $ 400,000,000      
Long-term Debt, Gross $ 0 400,000,000    
Subordinated Debentures Due 2042 [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Interest Rate, Stated Percentage 6.20%      
Debt Instrument, Face Amount $ 400,000,000      
Long-term Debt, Gross $ 400,000,000 400,000,000    
Senior Notes Due 2023 [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Interest Rate, Stated Percentage 4.70%      
Debt Instrument, Face Amount $ 400,000,000      
Long-term Debt, Gross $ 400,000,000 399,000,000    
Notes Payable to Banks [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Interest Rate, Stated Percentage 4.09%      
Debt Instrument, Face Amount $ 100,000,000      
Long-term Debt, Gross $ 80,000,000 83,000,000    
Senior Notes Due 2029 [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Interest Rate, Stated Percentage 3.90%      
Debt Instrument, Face Amount $ 600,000,000      
Long-term Debt, Gross $ 599,000,000 599,000,000    
Senior Notes Due 2030        
Debt Instrument [Line Items]        
Debt Instrument, Interest Rate, Stated Percentage 3.15%      
Debt Instrument, Face Amount $ 600,000,000      
Long-term Debt, Gross $ 597,000,000 597,000,000    
Debt Instrument, Offering Date Jun. 09, 2020      
Proceeds from Debt, Net of Issuance Costs $ 593,000,000      
Debt Related Commitment Fees and Debt Issuance Costs $ 5,000,000      
Surplus Note Due 2051        
Debt Instrument [Line Items]        
Debt Instrument, Interest Rate, Stated Percentage 4.00%      
Debt Instrument, Face Amount $ 500,000,000      
Long-term Debt, Gross $ 500,000,000 0    
Debt Instrument, Offering Date Dec. 13, 2021      
Debt Related Commitment Fees and Debt Issuance Costs $ 6,000,000      
Syndicated Credit Facility $850 Million [Member]        
Debt Instrument [Line Items]        
Line of Credit Facility, Maximum Borrowing Capacity 850,000,000      
Long-term Line of Credit [1] 21,000,000 $ 21,000,000    
Revolving Credit Facility        
Debt Instrument [Line Items]        
Line of Credit Facility, Maximum Borrowing Capacity $ 1,025,000,000      
[1] Represents issued but undrawn letters of credit. There was no cash borrowed for the periods presented.