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Business Combinations Acquired Finite-Lived Intangible Assets (Details)
$ in Millions
 9 Months Ended
Sep. 30, 2025
USD ($)
Finite-Lived Intangible Assets [Line Items]  
Acquired finite-lived intangible assets $ 115
Acquired Finite-Lived Intangible Assets, Weighted Average Useful Life 8 years
Total acquired indefinite-lived intangible assets - operating licenses and certificates $ 749
Customer-Related Intangible Assets  
Finite-Lived Intangible Assets [Line Items]  
Acquired finite-lived intangible assets $ 33
Acquired Finite-Lived Intangible Assets, Weighted Average Useful Life 9 years
Trademarks and Technology  
Finite-Lived Intangible Assets [Line Items]  
Acquired finite-lived intangible assets $ 21
Acquired Finite-Lived Intangible Assets, Weighted Average Useful Life 2 years
Other Intangible Assets  
Finite-Lived Intangible Assets [Line Items]  
Acquired finite-lived intangible assets $ 61
Acquired Finite-Lived Intangible Assets, Weighted Average Useful Life 9 years