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Goodwill and Intangible Assets Gross carrying value, accumulated amortization and net carrying value of intangible assets (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Intangible Assets [Line Items]    
Intangible Assets, Gross (Excluding Goodwill) $ 31,618 $ 22,473
Intangible Assets, Accumulated Amortization (8,350) (7,279)
Intangible Assets, Net (Excluding Goodwill) 23,268 15,194
Customer-Related Intangible Assets [Member]    
Intangible Assets [Line Items]    
Intangible Assets, Gross (Excluding Goodwill) 17,190 16,636
Intangible Assets, Accumulated Amortization (6,675) (5,909)
Intangible Assets, Net (Excluding Goodwill) 10,515 10,727
Trademarks and Technology [Member]    
Intangible Assets [Line Items]    
Intangible Assets, Gross (Excluding Goodwill) 2,917 2,508
Intangible Assets, Accumulated Amortization (1,284) (958)
Intangible Assets, Net (Excluding Goodwill) 1,633 1,550
Operating licenses and certificates, trademarks, and other indefinite-lived [Member]    
Intangible Assets [Line Items]    
Intangible Assets, Gross (Excluding Goodwill) 10,454 2,116
Intangible Assets, Accumulated Amortization 0 0
Intangible Assets, Net (Excluding Goodwill) 10,454 2,116
Other Intangible Assets [Member]    
Intangible Assets [Line Items]    
Intangible Assets, Gross (Excluding Goodwill) 1,057 1,213
Intangible Assets, Accumulated Amortization (391) (412)
Intangible Assets, Net (Excluding Goodwill) $ 666 $ 801