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Financial Instruments - Schedule of Cash, Cash Equivalents and Marketable Securities (Details) - USD ($) $ in Millions | Jun. 30, 2016 | Dec. 31, 2015
--- | --- | ---
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Cash and Cash Equivalents | $ 766 | $ 614
Short-Term Marketable Securities | 87 | 47
Long-Term Marketable Securities | 38 | 37
Cash | 740 | 598
Cash, cash equivalents and marketable securities, Amortized Cost | 891 | 698
Cash, cash equivalents and marketable securities, Fair Value | 891 | 698
Money Market Funds |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Cash equivalents | 18 | 11
Level 2 |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Amortized Cost | 133 | 89
Fair Value | 133 | 89
Cash and Cash Equivalents | 8 | 5
Short-Term Marketable Securities | 87 | 47
Long-Term Marketable Securities | 38 | 37
Level 2 | U.S. Agency Securities |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Amortized Cost | 29 | 13
Fair Value | 29 | 13
Cash and Cash Equivalents | 3 |
Short-Term Marketable Securities | 26 | 9
Long-Term Marketable Securities |  | 4
Level 2 | US treasury securities |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Amortized Cost | 12 | 16
Fair Value | 12 | 16
Cash and Cash Equivalents | 4 | 4
Short-Term Marketable Securities | 8 | 12
Level 2 | Certificates of Deposit |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Amortized Cost | 7 | 5
Fair Value | 7 | 5
Short-Term Marketable Securities | 7 | 4
Long-Term Marketable Securities |  | 1
Level 2 | Commercial Paper |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Amortized Cost | 5 | 1
Fair Value | 5 | 1
Cash and Cash Equivalents | 1 |
Short-Term Marketable Securities | 4 | 1
Level 2 | Corporate Debt Securities |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Amortized Cost | 80 | 54
Fair Value | 80 | 54
Cash and Cash Equivalents |  | 1
Short-Term Marketable Securities | 42 | 21
Long-Term Marketable Securities | $ 38 | $ 32

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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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