Segment Reporting - Information about Assets by Segment (Detail) - USD ($) $ in Millions		Jun. 30, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Total tangible assets		$ 6,463	$ 3,223
Goodwill		3,926
Other intangibles, net		1,039
Total assets	[1]	11,428	3,223
Operating Segments [Member] | NCSA [Member]
Segment Reporting Information [Line Items]
Total tangible assets		2,080	917
Operating Segments [Member] | EARC [Member]
Segment Reporting Information [Line Items]
Total tangible assets		641	3
Operating Segments [Member] | MENA [Member]
Segment Reporting Information [Line Items]
Total tangible assets		1,494	1,022
Operating Segments [Member] | APAC [Member]
Segment Reporting Information [Line Items]
Total tangible assets		1,158	887
Operating Segments [Member] | Technology [Member]
Segment Reporting Information [Line Items]
Total tangible assets		944
Corporate [Member]
Segment Reporting Information [Line Items]
Total tangible assets		$ 146	$ 394

[1] Our marine vessels are included in the area in which they were located as of the reporting date.