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Intangible Assets - Schedule of Intangible Assets by Class (Details) - USD ($)
$ in Millions
Jun. 30, 2022
Dec. 31, 2021
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount $ 21,183 $ 21,249
Accumulated Amortization 8,167 7,240
Net Book Value 13,016 14,009
Customer relationships    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 14,758 15,103
Accumulated Amortization 5,745 5,112
Net Book Value 9,013 9,991
Acquired software and technology    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 2,501 2,522
Accumulated Amortization 1,074 901
Net Book Value 1,427 1,621
Trade names    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 631 612
Accumulated Amortization 265 228
Net Book Value 366 384
Purchased software    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 1,086 1,133
Accumulated Amortization 510 479
Net Book Value 576 654
Capitalized software and other intangibles    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 2,207 1,879
Accumulated Amortization 573 520
Net Book Value $ 1,634 $ 1,359