Goodwill and Other Intangibles (Changes in the Carrying Amount of Goodwill) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Goodwill [Roll Forward]
Beginning balance	$ 17,231	$ 16,251
Goodwill acquired	6,407	813
Other adjustments	(332)	167
Ending balance	23,306	17,231
Goodwill acquired	6,407	$ 813
Mc Griff Insurance Services L L C
Goodwill [Roll Forward]
Goodwill acquired	5,200
Goodwill acquired	$ 5,200