Goodwill and Other Intangibles (Tables)

12 Months Ended

Dec. 31, 2012

Table Text Block [Abstract]

Other Intangible Assets Table

		Gross Carrying		Accumulated		Net Carrying		Amortization
millions		Amount		Amortization		Amount		Expense
December 31, 2012
	Offshore platform leases	$	60	$	(36)	$	24	$	3
	Customer contracts		169		(5)		164		3
		$	229	$	(41)	$	188	$	6
December 31, 2011
	Offshore platform leases	$	60	$	(33)	$	27	$	2
	Customer contracts		165		(2)		163		2
		$	225	$	(35)	$	190	$	4