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Intangible Assets - Schedule of Intangible Assets by Class (Details) - USD ($) $ in Millions | Mar. 31, 2020 | Dec. 31, 2019
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Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 20,746 | $ 21,036
Accumulated Amortization | 3,742 | 3,394
Net Book Value | 17,004 | 17,642
Customer relationships |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 15,788 | 16,187
Accumulated Amortization | 2,461 | 2,145
Net Book Value | 13,327 | 14,042
Acquired software and technology |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 2,534 | 2,607
Accumulated Amortization | 651 | 639
Net Book Value | 1,883 | 1,968
Trade names |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 609 | 620
Accumulated Amortization | 118 | 105
Net Book Value | 491 | 515
Capitalized software development costs |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 995 | 942
Accumulated Amortization | 323 | 332
Net Book Value | 672 | 610
Purchased software |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 820 | 680
Accumulated Amortization | 189 | 173
Net Book Value | $ 631 | $ 507

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