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Intangible Assets - Schedule of Intangible Assets by Major Class (Detail) - USD ($) $ in Millions | Sep. 30, 2019 | Dec. 31, 2018
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Finite Lived Intangible Assets [Line Items] |  |
Gross Book Value | $ 9,728 | $ 12,465
Accumulated Amortization | 2,446 | 3,738
Net Book Value | 7,282 | 8,727
Customer Relationships |  |
Finite Lived Intangible Assets [Line Items] |  |
Gross Book Value | 3,859 | 4,768
Accumulated Amortization | 853 | 1,243
Net Book Value | 3,006 | 3,525
Technology/Technical Know-How |  |
Finite Lived Intangible Assets [Line Items] |  |
Gross Book Value | 2,526 | 3,494
Accumulated Amortization | 735 | 1,246
Net Book Value | 1,791 | 2,248
Tradenames |  |
Finite Lived Intangible Assets [Line Items] |  |
Gross Book Value | 1,911 | 2,799
Accumulated Amortization | 248 | 628
Net Book Value | 1,663 | 2,171
Other |  |
Finite Lived Intangible Assets [Line Items] |  |
Gross Book Value | 1,432 | 1,404
Accumulated Amortization | 610 | 621
Net Book Value | $ 822 | $ 783

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