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Segment and Geographic Information (Details 1) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Jun. 30, 2015 | Jun. 30, 2014 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue | $ 1,342 | $ 1,290 | $ 1,263 | $ 1,302 | $ 1,196 | $ 1,206 | $ 1,152 | $ 1,205 | $ 1,140 | $ 2,615 | $ 2,498 | $ 5,051 | $ 4,702 | $ 4,270
Long-lived Assets |  | 2,665 |  |  |  | 2,751 |  |  |  |  |  | 2,665 | 2,751 |
United States [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |  | 2,911 | 2,723 | 2,508
Long-lived Assets |  | 2,117 |  |  |  | 2,206 |  |  |  |  |  | 2,117 | 2,206 |
European region [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |  | 1,316 | 1,226 | 1,067
Long-lived Assets |  | 430 |  |  |  | 432 |  |  |  |  |  | 430 | 432 |
Asia [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |  | 528 | 483 | 453
Long-lived Assets |  | 54 |  |  |  | 59 |  |  |  |  |  | 54 | 59 |
Rest of the world [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |  | 296 | 270 | $ 242
Long-lived Assets |  | $ 64 |  |  |  | $ 54 |  |  |  |  |  | $ 64 | $ 54 |
Geographic Concentration Risk [Member] | Revenue [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration risk |  |  |  |  |  |  |  |  |  |  |  | 100.00% | 100.00% | 100.00%
Geographic Concentration Risk [Member] | Revenue [Member] | United States [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration risk |  |  |  |  |  |  |  |  |  |  |  | 58.00% | 58.00% | 59.00%
Geographic Concentration Risk [Member] | Revenue [Member] | European region [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration risk |  |  |  |  |  |  |  |  |  |  |  | 26.00% | 26.00% | 25.00%
Geographic Concentration Risk [Member] | Revenue [Member] | Asia [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration risk |  |  |  |  |  |  |  |  |  |  |  | 10.00% | 10.00% | 11.00%
Geographic Concentration Risk [Member] | Revenue [Member] | Rest of the world [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration risk |  |  |  |  |  |  |  |  |  |  |  | 6.00% | 6.00% | 5.00%
Geographic Concentration Risk [Member] | Long-lived Assets [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration risk |  |  |  |  |  |  |  |  |  |  |  | 100.00% | 100.00% |
Geographic Concentration Risk [Member] | Long-lived Assets [Member] | United States [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration risk |  |  |  |  |  |  |  |  |  |  |  | 80.00% | 80.00% |
Geographic Concentration Risk [Member] | Long-lived Assets [Member] | European region [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration risk |  |  |  |  |  |  |  |  |  |  |  | 16.00% | 16.00% |
Geographic Concentration Risk [Member] | Long-lived Assets [Member] | Asia [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration risk |  |  |  |  |  |  |  |  |  |  |  | 2.00% | 2.00% |
Geographic Concentration Risk [Member] | Long-lived Assets [Member] | Rest of the world [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration risk |  |  |  |  |  |  |  |  |  |  |  | 2.00% | 2.00% |

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