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Intangible Assets - Schedule of Intangible Assets by Class (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023 | Dec. 31, 2023
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Gross Carrying Amount | $ 22,024 |  | $ 22,024 |  | $ 21,901
Accumulated Amortization | 11,472 |  | 11,472 |  | 10,691
Net Book Value | 10,552 |  | 10,552 |  | 11,210
Amortization of intangible assets | 586 | $ 614 | 1,200 | $ 1,200 |
Customer relationships |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Gross Carrying Amount | 14,550 |  | 14,550 |  | 14,669
Accumulated Amortization | 8,116 |  | 8,116 |  | 7,594
Net Book Value | 6,434 |  | 6,434 |  | 7,075
Acquired software and technology |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Gross Carrying Amount | 2,110 |  | 2,110 |  | 2,148
Accumulated Amortization | 1,228 |  | 1,228 |  | 1,148
Net Book Value | 882 |  | 882 |  | 1,000
Trade names |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Gross Carrying Amount | 638 |  | 638 |  | 641
Accumulated Amortization | 384 |  | 384 |  | 356
Net Book Value | 254 |  | 254 |  | 285
Purchased software |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Gross Carrying Amount | 1,030 |  | 1,030 |  | 1,087
Accumulated Amortization | 489 |  | 489 |  | 520
Net Book Value | 541 |  | 541 |  | 567
Capitalized software and other intangibles |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Gross Carrying Amount | 3,696 |  | 3,696 |  | 3,356
Accumulated Amortization | 1,255 |  | 1,255 |  | 1,073
Net Book Value | $ 2,441 |  | $ 2,441 |  | $ 2,283

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