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Depreciation and Amortization (Details) - USD ($) $ in Millions | 6 Months Ended
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Jun. 30, 2017 | Jun. 30, 2016
Depreciation, Depletion and Amortization [Abstract] |  |
Depreciation and amortization expense | $ 64 | $ 66

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- References No definition available. + Details
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- Definition The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 + Details
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