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Accounting Policies - Intangible Assets (Details)
 12 Months Ended
Dec. 31, 2017
Trademarks  
Disclosure of detailed information about intangible assets [line items]  
Estimated useful lives P4Y
Licenses | Minimum  
Disclosure of detailed information about intangible assets [line items]  
Estimated useful lives P3Y
Licenses | Maximum  
Disclosure of detailed information about intangible assets [line items]  
Estimated useful lives P14Y
Subscriber lists | Minimum  
Disclosure of detailed information about intangible assets [line items]  
Estimated useful lives P4Y
Subscriber lists | Maximum  
Disclosure of detailed information about intangible assets [line items]  
Estimated useful lives P10Y
Other intangible assets | Minimum  
Disclosure of detailed information about intangible assets [line items]  
Estimated useful lives P3Y
Other intangible assets | Maximum  
Disclosure of detailed information about intangible assets [line items]  
Estimated useful lives P20Y