Acquisitions - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions		9 Months Ended	12 Months Ended
	Apr. 02, 2016	Dec. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Business Acquisition [Line Items]
Revenues				$ 29,438	$ 44,306
Acquisitions and investments, net of cash acquired			$ 847	2,398	443
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	285
Cameron | Inventory Fair Value Adjustment
Business Acquisition [Line Items]
After-tax amortization charges included in pro forma amounts				209	209
Other Acquisitions
Business Acquisition [Line Items]
Acquisitions and investments, net of cash acquired			$ 847	$ 407	$ 443