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Intangible Assets - Schedule of Intangible Assets by Class (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Amount | $ 21,249 | $ 20,696 |
Accumulated Amortization | 7,240 | 5,338 |
Net Book Value | 14,009 | 15,358 |
Customer relationships |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Amount | 15,103 | 15,271 |
Accumulated Amortization | 5,112 | 3,668 |
Net Book Value | 9,991 | 11,603 |
Acquired software and technology |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Amount | 2,522 | 2,562 |
Accumulated Amortization | 901 | 879 |
Net Book Value | 1,621 | 1,683 |
Trade names |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Amount | 612 | 618 |
Accumulated Amortization | 228 | 172 |
Net Book Value | 384 | 446 |
Purchased software |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Amount | 1,133 | 913 |
Accumulated Amortization | 479 | 207 |
Net Book Value | 654 | 706 |
Capitalized software and other intangibles |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Amount | 1,879 | 1,332 |
Accumulated Amortization | 520 | 412 |
Net Book Value | 1,359 | 920 |
Gross software development costs capitalized | $ 613 | $ 462 | $ 339

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