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Intangible Assets - Schedule of Intangible Assets by Class (Details) - USD ($) $ in Millions | Sep. 30, 2020 | Dec. 31, 2019
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Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 20,461 | $ 21,036
Accumulated Amortization | 4,812 | 3,394
Net Book Value | 15,649 | 17,642
Customer relationships |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 15,124 | 16,187
Accumulated Amortization | 3,217 | 2,145
Net Book Value | 11,907 | 14,042
Acquired software and technology |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 2,555 | 2,607
Accumulated Amortization | 802 | 639
Net Book Value | 1,753 | 1,968
Trade names |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 616 | 620
Accumulated Amortization | 154 | 105
Net Book Value | 462 | 515
Capitalized software and other intangibles |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 1,236 | 942
Accumulated Amortization | 400 | 332
Net Book Value | 836 | 610
Purchased software |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 930 | 680
Accumulated Amortization | 239 | 173
Net Book Value | $ 691 | $ 507

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