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Debt (Schedule of debt instruments) (Details) - USD ($)
Dec. 31, 2021
Dec. 31, 2020
Debt Instrument [Line Items]    
Long term debt $ 2,779,000,000 $ 2,776,000,000
Total $ 2,779,000,000 2,776,000,000
3.950%, face amount of $550, due May 15, 2024    
Debt Instrument [Line Items]    
Stated interest rate 3.95%  
Face amount $ 550,000,000  
Long term debt $ 549,000,000 548,000,000
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 $ 499,000,000 499,000,000
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 $ 497,000,000 496,000,000
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 $ 496,000,000 496,000,000
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 $ 495,000,000 495,000,000
Debenture of CNAF, 7.250%, face amount of $243, due November 15, 2023    
Debt Instrument [Line Items]    
Stated interest rate 7.25%  
Face amount $ 243,000,000  
Long term debt $ 243,000,000 $ 242,000,000