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Segment Information - Schedule of consolidated non-current assets by geographic area (Details) - USD ($) $ in Millions | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Long-lived assets | $ 13,051 | $ 13,805
United States [Member] |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Long-lived assets | 7,072 | 7,793
Europe, Middle East and Africa [Member] |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Long-lived assets | 2,270 | 2,179
Asia Pacific [Member] |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Long-lived assets | 570 | 640
Americas other than U.S. [Member] |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Long-lived assets | 416 | 493
United Kingdom [Member] |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Long-lived assets | $ 2,723 | $ 2,700

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- Definition Sum of the carrying amounts as of the balance sheet date of all assets that are expected to be realized in cash, sold or consumed after one year or beyond the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.10-17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 18 -Article 5 + Details
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