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Fair Value Disclosures - Narrative (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Debt Instrument [Line Items]    
Carrying value of long-term debt portfolio $ 20,963 $ 17,400
Level 2    
Debt Instrument [Line Items]    
Estimated fair value of long-term debt portfolio $ 19,707 $ 16,234