Restructurings - Narrative (Details) - Jun. 30, 2015 $ in Millions	USD ($) location	USD ($) location
Restructuring Cost and Reserve [Line Items]
Crude oil, lowest prices, number of years evaluated	5 years
Percentage reduction in full-time employee base		25.00%
Minimum [Member]
Restructuring Cost and Reserve [Line Items]
Expected additional restructuring charges to incur	$ 2	$ 2
Maximum [Member]
Restructuring Cost and Reserve [Line Items]
Expected additional restructuring charges to incur	$ 3	$ 3
Towed Streamer [Member] | Systems [Member]
Restructuring Cost and Reserve [Line Items]
Number of locations | location	2	2