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Employee Benefit Plans - Additional Information (Detail) $ in Millions | 12 Months Ended
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Dec. 31, 2015 USD ($) Employees | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($)
Compensation Related Costs Disclosure [Line Items] |  |  |
Expenses for defined-contribution plans | $ 95 | $ 115 | $ 96
Net periodic benefit cost | 5 | $ 7 | $ 10
Defined benefit plan, expected future benefit payments in year five | $ 35 |  |
Expected years of defined benefit plans | 5 years |  |
Expected future benefit amounts to pay, total | $ 370 |  |
United States [Member] |  |  |
Compensation Related Costs Disclosure [Line Items] |  |  |
Number of U.S retirees and spouses participate in defined benefit health care plans | Employees | 1,900 |  |
Number of U.S. employees participate in defined benefit health care plans | Employees | 75 |  |
Norway [Member] |  |  |
Compensation Related Costs Disclosure [Line Items] |  |  |
Number of active employees participate in defined benefit plan | Employees | 300 |  |

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- Definition Defined Benefit Plan Estimated Future Employer Contributions. + References No definition available. + Details
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- Definition Defined benefit plan number of United States employees participate in defined benefit health care plans. + References No definition available. + Details
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- Definition Number of retirees and spouses participate in defined benefit health care plans. + References No definition available. + Details
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- Definition Amount of benefits from a defined benefit plan expected to be paid in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition The total amount of net periodic benefit cost for defined benefit plans for the period. Periodic benefit costs include the following components: service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition The amount of the cost recognized during the period for defined contribution plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942 + Details
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