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Financial Instruments (Details) (USD $)
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3 Months Ended | 6 Months Ended | 1 Months Ended | ||||||||||||||||||||||
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Jun. 30, 2013
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Jun. 30, 2013
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Dec. 31, 2012
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Jun. 30, 2013
Shelf Drilling Holdings, Ltd
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Jun. 30, 2013
Carrying amount
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Dec. 31, 2012
Carrying amount
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Jun. 30, 2013
Carrying amount
Other current assets
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Dec. 31, 2012
Carrying amount
Other current assets
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Jun. 30, 2013
Carrying amount
Other assets
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Dec. 31, 2012
Carrying amount
Other assets
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Jun. 30, 2013
Carrying amount
TPDI and ADDCL Credit Facilities and other obligations
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Dec. 31, 2012
Carrying amount
TPDI and ADDCL Credit Facilities and other obligations
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Jun. 30, 2013
Carrying amount
Aker Drilling
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Dec. 31, 2012
Carrying amount
Aker Drilling
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Jun. 30, 2013
Carrying amount
Consolidated Variable Interest Entities
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Dec. 31, 2012
Carrying amount
Consolidated Variable Interest Entities
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Jun. 30, 2013
Fair value
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Dec. 31, 2012
Fair value
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Jun. 30, 2013
Fair value
Level 2
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Mar. 31, 2013
Fair value
Level 2
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Dec. 31, 2012
Fair value
Level 2
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Jun. 30, 2013
Fair value
Level 2
Aker Drilling
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Dec. 31, 2012
Fair value
Level 2
Aker Drilling
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Jun. 30, 2013
Fair value
Level 2
Consolidated Variable Interest Entities
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Dec. 31, 2012
Fair value
Level 2
Consolidated Variable Interest Entities
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| Financial instruments | |||||||||||||||||||||||||
| Cash and cash equivalents | $ 3,357,000,000 | $ 5,134,000,000 | $ 3,357,000,000 | $ 5,134,000,000 | |||||||||||||||||||||
| Notes and other loans receivable | 103,000,000 | 142,000,000 | 6,000,000 | 35,000,000 | 97,000,000 | 107,000,000 | 103,000,000 | 142,000,000 | |||||||||||||||||
| Preference shares | 196,000,000 | 196,000,000 | |||||||||||||||||||||||
| Restricted cash investments | 729,000,000 | 903,000,000 | |||||||||||||||||||||||
| Restricted cash investments | 695,000,000 | 857,000,000 | 34,000,000 | 60,000,000 | 661,000,000 | 797,000,000 | 695,000,000 | 843,000,000 | |||||||||||||||||
| Long-term debt, including current maturities | 10,621,000,000 | 12,268,000,000 | 11,630,000,000 | 13,899,000,000 | |||||||||||||||||||||
| Long-term debt of consolidated variable interest entities, including current maturities | 178,000,000 | 191,000,000 | 178,000,000 | 191,000,000 | 178,000,000 | 191,000,000 | 178,000,000 | 191,000,000 | |||||||||||||||||
| Derivative instruments, assets | 8,000,000 | 8,000,000 | |||||||||||||||||||||||
| Derivative instruments, liabilities | 15,000,000 | 15,000,000 | |||||||||||||||||||||||
| Carrying amount of cash equivalents | 2,500,000,000 | 2,500,000,000 | 4,200,000,000 | ||||||||||||||||||||||
| Cash proceeds received from the sale of preference shares | 185,000,000 | 185,000,000 | 185,000,000 | ||||||||||||||||||||||
| Debt | |||||||||||||||||||||||||
| Fixed rate debt | 10,600,000,000 | 11,700,000,000 | 11,600,000,000 | 13,300,000,000 | |||||||||||||||||||||
| Variable-rate debt | $ 579,000,000 | $ 178,000,000 | $ 579,000,000 |