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Employee Benefits - Defined Contribution Plan (Details) $ in Millions | 12 Months Ended | 24 Months Ended
--- | --- | ---
Dec. 31, 2015 USD ($) item | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($) | Dec. 31, 2015 USD ($) item
Deferred compensation plan |  |  |  |
Number of investments, which are taken as reference to measure the interest that may be acquired | item | 3 |  |  | 3
Employer contribution as percentage of the employees' reduced compensation | 3.00% |  |  |
Number of deferred compensation plans | item | 2 |  |  | 2
Deferred compensation plan expense |  | $ 3 | $ 6 |
Deferred compensation plan liability included in other liabilities | $ 38 | 43 |  | $ 38
Deferred compensation plan assets included in other current assets | $ 43 | 48 |  | $ 43
Investment income related to the mark-to-market of investments treated as trading securities |  | $ 3 | $ 6 |
Defined contribution plan covering domestic, salaried and clerical employees |  |  |  |
Defined contribution plans |  |  |  |
Employer contribution (as a percent of employee contributions) | 50.00% | 50.00% | 50.00% |
Employer contribution limit per calendar year (as a percent of compensation) | 6.00% | 6.00% | 6.00% |
Vesting percentage after one year of service |  |  | 20.00% | 20.00%
Additional vesting percentage with each additional complete year of service |  |  | 20.00% | 20.00%
Contribution expense | $ 2 | $ 2 | $ 2 |

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- Definition Represents the employer's contribution as a percentage of employees' reduced compensation under the deferred compensation plan which allows certain employees to reduce their compensation in exchange for values in investments. + References No definition available. + Details
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- Definition Represents the number of investments, which are taken as reference to measure the interest that may be acquired by employees in exchange for reduction in their compensation. + References No definition available. + Details
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- Definition Represents the deferred compensation plan investment income (loss) related to the mark-to-market of the investments treated as trading securities. + References No definition available. + Details
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- Definition Represents the percentage of vesting after first year of service. + References No definition available. + Details
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- Definition Represents the number of deferred compensation plans. + References No definition available. + Details
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- Definition Aggregate carrying value as of the balance sheet date of the liabilities for all deferred compensation arrangements payable beyond one year (or the operating cycle, if longer). + References No definition available. + Details
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- Definition Carrying amount as of the balance sheet date of assets held under deferred compensation agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + 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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- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
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