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Goodwill and Other Intangibles - Goodwill, Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Goodwill [Line Items]          
Goodwill impairment charge $ 5,725 $ 0 $ 5,725 $ 0  
Goodwill 85,478   85,478   $ 91,272
Cumulative goodwill impairments 5,700   5,700   6,600
Health Care Delivery Reporting Unit          
Goodwill [Line Items]          
Goodwill impairment charge 5,700       $ 0
Percentage the fair value of the reporting unit exceeds the carrying value         8.00%
Goodwill $ 4,200   $ 4,200