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Intangible Assets - Schedule of Intangible Assets by Class (Details) - USD ($) $ in Millions | Mar. 31, 2021 | Dec. 31, 2020
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Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 20,912 | $ 20,696
Accumulated Amortization | 5,917 | 5,338
Net Book Value | 14,995 | 15,358
Customer relationships |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 15,256 | 15,271
Accumulated Amortization | 4,085 | 3,668
Net Book Value | 11,171 | 11,603
Acquired software and technology |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 2,617 | 2,562
Accumulated Amortization | 953 | 879
Net Book Value | 1,664 | 1,683
Trade names |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 629 | 618
Accumulated Amortization | 189 | 172
Net Book Value | 440 | 446
Purchased software |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 971 | 913
Accumulated Amortization | 244 | 207
Net Book Value | 727 | 706
Capitalized software and other intangibles |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 1,439 | 1,332
Accumulated Amortization | 446 | 412
Net Book Value | $ 993 | $ 920

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