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Variable Interest Entities (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Assets      
Cash and cash equivalents $ 619 $ 900 $ 985
Accounts receivable 861 753  
Other current assets 27 32  
Licenses 2,232 1,895  
Property, plant and equipment, net 3,424 3,555  
Other assets and deferred charges 422 434  
Liabilities      
Current liabilities 918 887  
Consolidated Variable Interest Entities      
Assets      
Cash and cash equivalents 3 2  
Accounts receivable 473 39  
Other current assets 7 6  
Licenses 648 649  
Property, plant and equipment, net 89 93  
Other assets and deferred charges 304 15  
Total assets 1,524 804  
Liabilities      
Current liabilities 36 18  
Deferred liabilities and credits 12 12  
Total liabilities $ 48 $ 30