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Intangible Assets - Schedule of Intangible Assets by Major Class (Detail) - USD ($) $ in Millions | Sep. 30, 2020 | Dec. 31, 2019
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Finite Lived Intangible Assets [Line Items] |  |
Gross Book Value | $ 5,349 | $ 9,676
Accumulated Amortization | 1,776 | 2,587
Net Book Value | 3,573 | 7,089
Customer Relationships |  |
Finite Lived Intangible Assets [Line Items] |  |
Gross Book Value | 1,744 | 3,779
Accumulated Amortization | 467 | 868
Net Book Value | 1,277 | 2,911
Technology/Technical Know-How |  |
Finite Lived Intangible Assets [Line Items] |  |
Gross Book Value | 1,290 | 2,498
Accumulated Amortization | 467 | 779
Net Book Value | 823 | 1,719
Tradenames |  |
Finite Lived Intangible Assets [Line Items] |  |
Gross Book Value | 767 | 1,885
Accumulated Amortization | 157 | 264
Net Book Value | 610 | 1,621
Other |  |
Finite Lived Intangible Assets [Line Items] |  |
Gross Book Value | 1,548 | 1,514
Accumulated Amortization | 685 | 676
Net Book Value | $ 863 | $ 838

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