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Intangible Assets - Schedule of Intangible Assets by Class (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Finite-Lived Intangible Assets [Line Items]      
Gross Carrying Amount $ 21,975   $ 21,901
Accumulated Amortization 11,049   10,691
Net Book Value 10,926   11,210
Amortization of intangible assets 534 $ 595  
Customer relationships      
Finite-Lived Intangible Assets [Line Items]      
Gross Carrying Amount 14,593   14,669
Accumulated Amortization 7,846   7,594
Net Book Value 6,747   7,075
Acquired software and technology      
Finite-Lived Intangible Assets [Line Items]      
Gross Carrying Amount 2,121   2,148
Accumulated Amortization 1,180   1,148
Net Book Value 941   1,000
Trade names      
Finite-Lived Intangible Assets [Line Items]      
Gross Carrying Amount 639   641
Accumulated Amortization 370   356
Net Book Value 269   285
Purchased software      
Finite-Lived Intangible Assets [Line Items]      
Gross Carrying Amount 1,078   1,087
Accumulated Amortization 482   520
Net Book Value 596   567
Capitalized software and other intangibles      
Finite-Lived Intangible Assets [Line Items]      
Gross Carrying Amount 3,544   3,356
Accumulated Amortization 1,171   1,073
Net Book Value $ 2,373   $ 2,283