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Debt and Redeemable Preferred Securities of Subsidiaries (Narrative) (Details)
$ in Millions
Dec. 31, 2024
USD ($)
Debt Instrument  
Scheduled maturity of long-term debt in 2020 $ 566
Scheduled maturity of long-term debt in 2021 410
Scheduled maturity of long-term debt in 2022 606
Scheduled maturity of long-term debt in 2023 700
Scheduled maturity of long-term debt in 2024 704
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%