Segment Reporting - Information about Assets by Segment (Detail) - USD ($) $ in Millions		Sep. 30, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Total tangible assets		$ 6,342	$ 3,223
Goodwill		4,708
Other intangibles, net		1,006
Total assets	[1]	12,056	3,223
Operating Segments [Member] | NCSA [Member]
Segment Reporting Information [Line Items]
Total tangible assets		2,548	917
Operating Segments [Member] | EARC [Member]
Segment Reporting Information [Line Items]
Total tangible assets		601	3
Operating Segments [Member] | MENA [Member]
Segment Reporting Information [Line Items]
Total tangible assets		1,595	1,022
Operating Segments [Member] | APAC [Member]
Segment Reporting Information [Line Items]
Total tangible assets		649	887
Operating Segments [Member] | Technology [Member]
Segment Reporting Information [Line Items]
Total tangible assets		979
Corporate [Member]
Segment Reporting Information [Line Items]
Total tangible assets	[2]	$ (30)	$ 394

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

[2] Corporate assets at September 30, 2018 include negative cash balances associated with our international cash pooling program.