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Debt and Redeemable Preferred Securities of Subsidiaries (Narrative) (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Debt Instrument    
Scheduled maturity of long-term debt in 2020 $ 566  
Scheduled maturity of long-term debt in 2021 559  
Scheduled maturity of long-term debt in 2022 403  
Scheduled maturity of long-term debt in 2023 601  
Scheduled maturity of long-term debt in 2024 $ 698  
2.00% Notes due November 2, 2031    
Debt Instrument    
Face amount of note   $ 600
Interest rate of note 2.00%  
Credit facility expiring June 2026    
Debt Instrument    
Revolving credit facility $ 2,000  
Credit facility expiring June 2022    
Debt Instrument    
Revolving credit facility 750  
4.50% notes due February 16, 2033    
Debt Instrument    
Face amount of note $ 350  
Interest rate of note 4.50%