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Debt (Schedule of debt instruments) (Details) - USD ($)
Dec. 31, 2024
Dec. 31, 2023
Debt Instrument [Line Items]    
Short-term debt $ 0 $ 550,000,000
Long-term debt 2,973,000,000 2,481,000,000
Total debt $ 2,973,000,000 3,031,000,000
Senior notes of CNAF: 3.950%, face amount of $550, due May 15, 2024    
Debt Instrument [Line Items]    
Stated interest rate 3.95%  
Face amount $ 550,000,000  
4.500%, face amount of $500, due March 1, 2026    
Debt Instrument [Line Items]    
Stated interest rate 4.50%  
Face amount $ 500,000,000  
Long-term debt $ 500,000,000 500,000,000
3.450%, face amount of $500, due August 15, 2027    
Debt Instrument [Line Items]    
Stated interest rate 3.45%  
Face amount $ 500,000,000  
Long-term debt $ 498,000,000 498,000,000
3.900%, face amount of $500, due May 1, 2029    
Debt Instrument [Line Items]    
Stated interest rate 3.90%  
Face amount $ 500,000,000  
Long-term debt $ 498,000,000 497,000,000
2.050%, face amount of $500, due August 15, 2030    
Debt Instrument [Line Items]    
Stated interest rate 2.05%  
Face amount $ 500,000,000  
Long-term debt $ 497,000,000 496,000,000
5.500%, face amount of $500, due June 15, 2033    
Debt Instrument [Line Items]    
Stated interest rate 5.50%  
Face amount $ 500,000,000  
Long-term debt $ 491,000,000 490,000,000
5.125%, face amount of $500, due February 15, 2034    
Debt Instrument [Line Items]    
Stated interest rate 5.125%  
Face amount $ 500,000,000  
Long-term debt 489,000,000 0
Senior notes of CNAF: 3.950%, face amount of $550, due May 15, 2024    
Debt Instrument [Line Items]    
Short-term debt $ 0 $ 550,000,000