Segment Information - (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Segment Reporting Information [Line Items]
Assets	$ 20,319		$ 20,319		$ 24,080
Summarized financial information [Abstract]
Revenue	2,408	$ 3,968	5,078	$ 8,562
Operating Profit (Loss) Before Tax	(760)	(197)	(1,374)	(1,025)
Corporate
Segment Reporting Information [Line Items]
Assets	3,410		3,410		1,921
Summarized financial information [Abstract]
Revenue	0	0	0	0
Operating Profit (Loss) Before Tax	(29)	(42)	(61)	(91)
Loss on early extinguishment of debt
Summarized financial information [Abstract]
Revenue	0	0	0	0
Operating Profit (Loss) Before Tax	(142)	0	(142)	0
Interest expense, net
Summarized financial information [Abstract]
Revenue	0	0	0	0
Operating Profit (Loss) Before Tax	(48)	(53)	(103)	(107)
Impairment and restructuring charges
Summarized financial information [Abstract]
Revenue	0	0	0	0
Operating Profit (Loss) Before Tax	(1,126)	(76)	(1,286)	(649)
Goodwill
Summarized financial information [Abstract]
Revenue	0	0	0	0
Operating Profit (Loss) Before Tax	(1,841)	0	(1,841)	0
Merger and related costs
Summarized financial information [Abstract]
Revenue	0	0	0	0
Operating Profit (Loss) Before Tax	(78)	(83)	(180)	(111)
Merger termination fee
Summarized financial information [Abstract]
Revenue	0	0	0	0
Operating Profit (Loss) Before Tax	3,500	0	3,500	0
Litigation settlements
Summarized financial information [Abstract]
Revenue	0	0	0	0
Operating Profit (Loss) Before Tax	0	13	0	13
North America
Segment Reporting Information [Line Items]
Assets	3,745		3,745		6,599
Summarized financial information [Abstract]
Revenue	668	1,498	1,487	3,504
Operating Profit (Loss) Before Tax	(311)	(150)	(536)	(359)
Latin America
Segment Reporting Information [Line Items]
Assets	1,690		1,690		2,323
Summarized financial information [Abstract]
Revenue	235	439	512	932
Operating Profit (Loss) Before Tax	(243)	45	(309)	78
Middle East/Asia Pacific
Segment Reporting Information [Line Items]
Assets	2,870		2,870		3,441
Summarized financial information [Abstract]
Revenue	651	856	1,369	1,772
Operating Profit (Loss) Before Tax	(142)	60	(93)	122
Industrial Services
Segment Reporting Information [Line Items]
Assets	683		683		1,106
Summarized financial information [Abstract]
Revenue	273	306	518	590
Operating Profit (Loss) Before Tax	(43)	32	(47)	42
Total Operations
Summarized financial information [Abstract]
Revenue	2,408	3,968	5,078	8,562
Operating Profit (Loss) Before Tax	(996)	44	(1,261)	(80)
Europe/Africa/Russia Caspian
Segment Reporting Information [Line Items]
Assets	2,589		2,589		3,077
Summarized financial information [Abstract]
Revenue	581	869	1,192	1,764
Operating Profit (Loss) Before Tax	(257)	$ 57	(276)	$ 37
Shared assets
Segment Reporting Information [Line Items]
Assets	5,332		5,332		5,613
Continuing Operations
Segment Reporting Information [Line Items]
Assets	$ 16,909		$ 16,909		$ 22,159