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Acquisitions - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions |  | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Apr. 02, 2016 | Dec. 31, 2016 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Business Acquisition [Line Items] |  |  |  |  |
Revenues |  |  |  |  | $ 29,438
Acquisitions and investments, net of cash acquired |  |  | $ 292 | $ 847 | 2,398
Cameron |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Common stock received by Cameron shareholders | 71.60% |  |  |  |
Cash payment in exchange of each share of common stock | $ 14.44 |  |  |  |
Revenues |  | $ 4,000 |  |  |
Pretax operating income |  | $ 700 |  |  |
After-tax merger and integration charges included or excluded in pro forma amounts |  |  |  |  | 285
Cameron | Inventory Fair Value Adjustment |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
After-tax amortization charges included in pro forma amounts |  |  |  |  | 209
Other Acquisitions |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Acquisitions and investments, net of cash acquired |  |  | $ 292 | $ 847 | $ 407

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- Definition The pro forma revenue for a period as if the business combination or combinations had been completed at the beginning of the period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(3) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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