Significant Accounting Policies (Details 2) (USD $)	3 Months Ended		12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2011 unit Y Assumption AssetGroup	Dec. 31, 2010	Dec. 31, 2009
Long-lived assets and definite-lived intangible assets
Minimum number of asset groups in which impairment is indicated for measurement of impairment			1
Loss on impairment of assets			$ 28,000,000
Loss on impairment of assets		1,000,000,000	5,229,000,000	1,010,000,000	334,000,000
Loss on impairment of assets held for sale			28,000,000
Goodwill and other indefinite-lived intangible assets
Number of reporting units			2
Estimated loss on impairment of goodwill	5,200,000,000		5,200,000,000
Estimated loss on impairment of goodwill per diluted share			$ 16.15
Impairment loss on trade name intangible asset					6,000,000
Pension and other postretirement benefits
Recognition period of investment gains or losses related to asset valuation for determining net periodic benefit cost (in years)			5
Conditional amortization gains or losses as percentage of greater of plan assets or liabilities, minimum			10.00%
Number of critical fair value assumptions			2
Aggregate liability of pension and other postretirement benefit plan obligations	640,000,000	469,000,000	640,000,000	469,000,000
Net periodic benefit costs			88,000,000	91,000,000	87,000,000
Customer relationships
Long-lived assets and definite-lived intangible assets
Loss on impairment of assets per diluted share					$ 0.15
Impairment					49,000,000
ADTI trade name
Long-lived assets and definite-lived intangible assets
Loss on impairment of assets per diluted share					$ 0.02
Goodwill and other indefinite-lived intangible assets
Impairment loss on trade name intangible asset					6,000,000
GSF Arctic II and GSF Arctic IV
Long-lived assets and definite-lived intangible assets
Loss on impairment of assets held for sale					279,000,000
Loss on impairment of assets per diluted share					$ 0.87
Standard Jackup asset group
Long-lived assets and definite-lived intangible assets
Impairment loss of long-lived assets				$ 1,000,000,000
Loss on impairment of assets per diluted share				$ 3.15