Business Segments - Summary Financial Data by Segment (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Segment Reporting Information [Line Items]
Revenues	$ 2,079	$ 2,208	$ 2,222	$ 2,273	$ 2,804	$ 2,678	$ 2,570	$ 2,329	$ 8,782	$ 10,381	$ 9,138
Depreciation and amortization									342	348	298
Segment operating income before interest and income taxes									1,340	1,427	1,209
Other costs									(773)	(73)	(92)
Income from continuing operations before income taxes									321	1,080	855
Consolidated capital expenditures									285	385	520
Consolidated total assets	11,500				12,892				11,500	12,892	14,249
Corporate
Segment Reporting Information [Line Items]
Corporate expenses									(108)	(145)	(162)
Interest, net									(138)	(129)	(100)
Other costs									(773)	(73)	(92)
Consolidated capital expenditures									36	96	102
Consolidated total assets	1,025				581				1,025	581	844
Discontinued Operations
Segment Reporting Information [Line Items]
Consolidated capital expenditures									0	7	13
Consolidated total assets	0				217				0	217	616
Elimination of intersegment earnings
Segment Reporting Information [Line Items]
Revenues									(184)	(271)	(184)
Segment operating income before interest and income taxes									(36)	(74)	(35)
Consolidated total assets	(861)				(877)				(861)	(877)	(654)
Subsea | Operating Segments
Segment Reporting Information [Line Items]
Revenues									2,753	3,067	2,813
Depreciation and amortization									87	113	85
Segment operating income before interest and income taxes									407	207	152
Consolidated capital expenditures									60	70	80
Consolidated total assets	4,735				5,571				4,735	5,571	5,897
Surface | Operating Segments
Segment Reporting Information [Line Items]
Revenues									1,957	2,411	2,077
Depreciation and amortization									135	126	106
Segment operating income before interest and income taxes									264	427	367
Consolidated capital expenditures									109	125	156
Consolidated total assets	2,667				2,756				2,667	2,756	2,705
Drilling | Operating Segments
Segment Reporting Information [Line Items]
Revenues									2,708	3,049	2,327
Depreciation and amortization									67	60	60
Segment operating income before interest and income taxes									528	474	311
Consolidated capital expenditures									44	38	111
Consolidated total assets	2,394				3,011				2,394	3,011	3,076
Valves & Measurement | Operating Segments
Segment Reporting Information [Line Items]
Revenues									1,548	2,125	2,105
Depreciation and amortization									53	49	47
Segment operating income before interest and income taxes									177	393	414
Consolidated capital expenditures									36	49	58
Consolidated total assets	$ 1,540				$ 1,633				$ 1,540	$ 1,633	$ 1,765