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Operating and Direct Financing Leases - Charter-out - Additional Information (Detail) (USD $) | Dec. 31, 2014 | Dec. 31, 2013
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Property Subject to or Available for Operating Lease [Line Items] |  |
Carrying amount of the vessels accounted for as operating leases | $ 6,800,000,000us-gaap_PropertySubjectToOrAvailableForOperatingLeaseNet | $ 6,400,000,000us-gaap_PropertySubjectToOrAvailableForOperatingLeaseNet
Cost of the vessels | 8,900,000,000us-gaap_PropertySubjectToOrAvailableForOperatingLeaseGross | 8,200,000,000us-gaap_PropertySubjectToOrAvailableForOperatingLeaseGross
Accumulated depreciation of the vessels | 2,100,000,000us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAccumulatedDepreciation | 1,800,000,000us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAccumulatedDepreciation
Charters Out [Member] |  |
Property Subject to or Available for Operating Lease [Line Items] |  |
Minimum scheduled future revenues to be received by the company | 10,200,000,000us-gaap_OperatingLeasesFutureMinimumPaymentsReceivable / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = us-gaap_PropertyAvailableForOperatingLeaseMember |
Minimum scheduled future revenues to be received by the company in current year | 1,400,000,000us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableCurrent / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = us-gaap_PropertyAvailableForOperatingLeaseMember |
Minimum scheduled future revenues to be received by the company in second year | 1,300,000,000us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableInTwoYears / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = us-gaap_PropertyAvailableForOperatingLeaseMember |
Minimum scheduled future revenues to be received by the company in third year | 1,300,000,000us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableInThreeYears / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = us-gaap_PropertyAvailableForOperatingLeaseMember |
Minimum scheduled future revenues to be received by the company in fourth year | 1,200,000,000us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableInFourYears / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = us-gaap_PropertyAvailableForOperatingLeaseMember |
Minimum scheduled future revenues to be received by the company in fifth year | 1,100,000,000us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableInFiveYears / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = us-gaap_PropertyAvailableForOperatingLeaseMember |
Minimum scheduled future revenues to be received by the company thereafter | $ 4,000,000,000us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableThereafter / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = us-gaap_PropertyAvailableForOperatingLeaseMember |

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- Definition Future minimum rental payments in aggregate as of the balance sheet date under operating leases. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6454179&loc=d3e41551-112718 + Details
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- Definition Future rental payments receivable within one year of the balance sheet date under an operating lease. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6454179&loc=d3e41551-112718 + Details
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- Definition Future rental payments receivable within the fifth year from the balance sheet date under an operating lease. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6454179&loc=d3e41551-112718 + Details
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- Definition Future rental payments receivable within the fourth year from the balance sheet date under an operating lease. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6454179&loc=d3e41551-112718 + Details
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- Definition Future rental payments receivable within the third year from the balance sheet date under an operating lease. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6454179&loc=d3e41551-112718 + Details
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- Definition Future rental payments receivable within the second year from the balance sheet date under an operating lease. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6454179&loc=d3e41551-112718 + Details
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- Definition Future minimum lease payments receivable under operating leases for periods greater than five years following the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6454179&loc=d3e41551-112718 + Details
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- Definition The amount of accumulated depreciation, by major property class, recorded on property subject to or available for lease as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6453916&loc=d3e41460-112716 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6454179&loc=d3e41551-112718 + Details
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- Definition Amount before accumulated depreciation of physical assets used in the normal conduct of business to produce goods and services subject to or available for lease. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6453916&loc=d3e41457-112716 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6454179&loc=d3e41551-112718 + Details
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- Definition The amount of property, by major property class, net of accumulated depreciation, subject to or available for lease as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6454179&loc=d3e41551-112718 + Details
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