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Significant Accounting Policies - Additional Information (Details) - USD ($) $ in Millions | 6 Months Ended
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Jun. 30, 2016 | Jun. 30, 2015
Accounting Policies [Abstract] |  |
Net windfalls recognized in additional paid-in capital | $ 3 |
Excess tax benefits from stock-based compensation | $ 6 | $ 30

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- Definition Amount of increase (decrease) in additional paid in capital (APIC) resulting from a tax benefit (deficiency) associated with an share-based compensation plan other than an employee stock ownership plan (ESOP). + References No definition available. + Details
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- Definition Amount of cash inflow from realized tax benefit related to deductible compensation cost reported on the entity's tax return for equity instruments in excess of the compensation cost for those instruments recognized for financial reporting purposes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 20 -Section 55 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=65896087&loc=d3e11374-113907 + Details
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