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Segment Information - Schedule of consolidated non-current assets by geographic area (Details) - USD ($) $ in Millions | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Fixed assets, net | $ 765 | $ 765
Goodwill, intangible assets and other | 12,382 | 12,253
Total | 13,147 | 13,018
United States |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Fixed assets, net | 443 | 432
Goodwill, intangible assets and other | 6,947 | 6,635
Total | 7,390 | 7,067
Americas other than U.S. |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Fixed assets, net | 62 | 48
Goodwill, intangible assets and other | 887 | 368
Total | 949 | 416
United Kingdom |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Fixed assets, net | 65 | 89
Goodwill, intangible assets and other | 2,091 | 2,606
Total | 2,156 | 2,695
Europe, Middle East and Africa |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Fixed assets, net | 85 | 89
Goodwill, intangible assets and other | 2,054 | 2,181
Total | 2,139 | 2,270
Asia Pacific |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Fixed assets, net | 110 | 107
Goodwill, intangible assets and other | 403 | 463
Total | $ 513 | $ 570

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