Business Segments (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015 USD ($)	Sep. 30, 2014 USD ($)	Sep. 30, 2015 USD ($) business_segment	Sep. 30, 2014 USD ($)
Segment Reporting [Abstract]
Number of business segments | business_segment			4
Segment Reporting Information [Line Items]
Revenues	$ 2,208	$ 2,678	$ 6,703	$ 7,577
Segment income before interest and income taxes	364	395	969	1,005
Other (costs) gains, net (see Note 4)	(44)	(19)	(658)	(62)
Income from continuing operations before income taxes	258	305	132	735
Operating Segments | Subsea
Segment Reporting Information [Line Items]
Revenues	758	779	2,047	2,195
Segment income before interest and income taxes	120	44	244	119
Operating Segments | Surface
Segment Reporting Information [Line Items]
Revenues	446	600	1,499	1,751
Segment income before interest and income taxes	49	105	210	304
Operating Segments | Drilling
Segment Reporting Information [Line Items]
Revenues	673	800	2,118	2,233
Segment income before interest and income taxes	146	159	400	323
Operating Segments | V&M
Segment Reporting Information [Line Items]
Revenues	376	558	1,185	1,597
Segment income before interest and income taxes	58	104	147	312
Eliminations of intersegment revenues/earnings
Segment Reporting Information [Line Items]
Revenues	(45)	(59)	(146)	(199)
Segment income before interest and income taxes	(9)	(17)	(32)	(53)
Corporate
Segment Reporting Information [Line Items]
Corporate expenses	(28)	(35)	(74)	(110)
Interest, net	(34)	(36)	(105)	(98)
Other (costs) gains, net (see Note 4)	$ (44)	$ (19)	$ (658)	$ (62)