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Financial Instruments (Tables) | 6 Months Ended
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Jun. 30, 2016
Investments All Other Investments [Abstract] |
Schedule of Cash, Cash Equivalents and Marketable Securities | The following tables show our cash and available-for-sale securities’ amortized cost, gross unrealized gains, gross unrealized losses and fair value by significant investment category recorded as cash and cash equivalents or short and long-term marketable securities for the periods presented (in millions):
|  | June 30, 2016 |
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Cash and |  |  | Short-Term |  |  | Long-Term |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Fair |  |  | Cash |  |  | Marketable |  |  | Marketable |
|  | Cost |  |  | Gains |  |  | Losses |  |  | Value |  |  | Equivalents |  |  | Securities |  |  | Securities |
Cash |  | $ | 740 |  |  | $ | - |  |  | $ | - |  |  | $ | 740 |  |  | $ | 740 |  |  | $ | - |  |  | $ | - |
Level 1: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds |  |  | 18 |  |  |  | - |  |  |  | - |  |  |  | 18 |  |  |  | 18 |  |  |  | - |  |  |  | - |
Level 2: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. agency securities |  |  | 29 |  |  |  | - |  |  |  | - |  |  |  | 29 |  |  |  | 3 |  |  |  | 26 |  |  |  | - |
U.S. treasury securities |  |  | 12 |  |  |  | - |  |  |  | - |  |  |  | 12 |  |  |  | 4 |  |  |  | 8 |  |  |  | - |
Certificates of deposit |  |  | 7 |  |  |  | - |  |  |  | - |  |  |  | 7 |  |  |  | - |  |  |  | 7 |  |  |  | - |
Commercial paper |  |  | 5 |  |  |  | - |  |  |  | - |  |  |  | 5 |  |  |  | 1 |  |  |  | 4 |  |  |  | - |
Corporate debt securities |  |  | 80 |  |  |  | - |  |  |  | - |  |  |  | 80 |  |  |  | - |  |  |  | 42 |  |  |  | 38 |
Subtotal |  |  | 133 |  |  |  | - |  |  |  | - |  |  |  | 133 |  |  |  | 8 |  |  |  | 87 |  |  |  | 38 |
Total |  | $ | 891 |  |  | $ | - |  |  | $ | - |  |  | $ | 891 |  |  | $ | 766 |  |  | $ | 87 |  |  | $ | 38 |
|  | December 31, 2015 |
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Cash and |  |  | Short-Term |  |  | Long-Term |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Fair |  |  | Cash |  |  | Marketable |  |  | Marketable |
|  | Cost |  |  | Gains |  |  | Losses |  |  | Value |  |  | Equivalents |  |  | Securities |  |  | Securities |
Cash |  | $ | 598 |  |  | $ | - |  |  | $ | - |  |  | $ | 598 |  |  | $ | 598 |  |  | $ | - |  |  | $ | - |
Level 1: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds |  |  | 11 |  |  |  | - |  |  |  | - |  |  |  | 11 |  |  |  | 11 |  |  |  | - |  |  |  | - |
Level 2: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. agency securities |  |  | 13 |  |  |  | - |  |  |  | - |  |  |  | 13 |  |  |  | - |  |  |  | 9 |  |  |  | 4 |
U.S. treasury securities |  |  | 16 |  |  |  | - |  |  |  | - |  |  |  | 16 |  |  |  | 4 |  |  |  | 12 |  |  |  | - |
Certificates of deposit |  |  | 5 |  |  |  | - |  |  |  | - |  |  |  | 5 |  |  |  | - |  |  |  | 4 |  |  |  | 1 |
Commercial paper |  |  | 1 |  |  |  | - |  |  |  | - |  |  |  | 1 |  |  |  | - |  |  |  | 1 |  |  |  | - |
Corporate debt securities |  |  | 54 |  |  |  | - |  |  |  | - |  |  |  | 54 |  |  |  | 1 |  |  |  | 21 |  |  |  | 32 |
Subtotal |  |  | 89 |  |  |  | - |  |  |  | - |  |  |  | 89 |  |  |  | 5 |  |  |  | 47 |  |  |  | 37 |
Total |  | $ | 698 |  |  | $ | - |  |  | $ | - |  |  | $ | 698 |  |  | $ | 614 |  |  | $ | 47 |  |  | $ | 37 |
Fair Value and Notional Principal Amounts of Outstanding or Unsettled Derivative Instruments | The following table shows the fair value and notional principal amounts of our outstanding derivative instruments that are not designated as hedging instruments for the periods presented:
| Balance Sheet Caption |  | June 30, 2016 |
|  |  |  | Fair Value of Derivative (2) |  |  | U.S. Dollar Notional |
|  |  |  | Asset |  |  | Liability |  |  |  |  |
|  |  |  | (in millions) |
Foreign exchange-forward contracts (1) | Prepaid expenses and other current assets |  | $ | 1 |  |  | $ | - |  |  | $ | 34 |
| Balance Sheet Caption |  | December 31, 2015 |
|  |  |  | Fair Value of Derivative (2) |  |  | U.S. Dollar Notional |
|  |  |  | Asset |  |  | Liability |  |  |  |  |
|  |  |  | (in millions) |
Foreign exchange-forward contracts (1) | Prepaid expenses and other current assets |  | $ | - |  |  | $ | - |  |  | $ | 25 |
| (1) | Derivative contracts address foreign exchange fluctuations for the Euro versus the U.S. Dollar.
| (2) | We measure the fair value of our outstanding or unsettled derivatives using Level 2 fair value inputs, as we use a pricing model that takes into account the contract terms as well as current foreign currency exchange rates in active markets.

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- Definition Tabular disclosure of the location and fair value amounts of derivative instruments (and nonderivative instruments that are designated and qualify as hedging instruments) reported in the statement of financial position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624163-113959 + Details
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