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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

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