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Goodwill and Other Intangible Assets, net (Changes in Goodwill and Net Carrying Amount of Intangible Assets) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Goodwill [Roll Forward]          
Goodwill, beginning of period     $ 6,791 $ 5,177 $ 5,177
Acquisitions     154   1,614
Goodwill, end of period $ 6,945   6,945   6,791
Intangible Assets [Roll Forward]          
Intangible assets, net, beginning of period     13,686 12,384 12,384
Acquisitions     (220)   1,430
Asset impairment 0 $ 0 (354) 0  
Amortization (38) $ (42) (102) $ (87) (128)
Intangible assets, net, end of period $ 13,010   $ 13,010   $ 13,686