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Goodwill and Intangible Assets Gross carrying value, accumulated amortization and net carrying value of intangible assets (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Intangible Assets [Line Items] |  |
Intangible Assets, Gross (Excluding Goodwill) | $ 16,311 | $ 15,421
Finite-Lived Intangible Assets, Accumulated Amortization | (5,455) | (5,072)
Intangible Assets, Net (Excluding Goodwill) | 10,856 | 10,349
Customer-Related Intangible Assets [Member] |  |
Intangible Assets [Line Items] |  |
Intangible Assets, Gross (Excluding Goodwill) | 13,428 | 12,968
Finite-Lived Intangible Assets, Accumulated Amortization | (4,575) | (4,319)
Intangible Assets, Net (Excluding Goodwill) | 8,853 | 8,649
Trademarks and Technology [Member] |  |
Intangible Assets [Line Items] |  |
Intangible Assets, Gross (Excluding Goodwill) | 1,597 | 1,186
Finite-Lived Intangible Assets, Accumulated Amortization | (624) | (525)
Intangible Assets, Net (Excluding Goodwill) | 973 | 661
Trademarks and Trade Names [Member] |  |
Intangible Assets [Line Items] |  |
Intangible Assets, Gross (Excluding Goodwill) | 680 | 726
Finite-Lived Intangible Assets, Accumulated Amortization | 0 | 0
Intangible Assets, Net (Excluding Goodwill) | 680 | 726
Other Intangible Assets [Member] |  |
Intangible Assets [Line Items] |  |
Intangible Assets, Gross (Excluding Goodwill) | 606 | 541
Finite-Lived Intangible Assets, Accumulated Amortization | (256) | (228)
Intangible Assets, Net (Excluding Goodwill) | $ 350 | $ 313

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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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