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Variable Interest Entities, Consolidated Balance Sheet (Details) - USD ($)
$ in Millions
Sep. 30, 2017
Dec. 31, 2016
Sep. 30, 2016
Dec. 31, 2015
Assets        
Cash and cash equivalents $ 784 $ 900 $ 985 $ 985
Accounts receivable 775 753    
Other current assets 31 32    
Licenses 2,234 1,895    
Property, plant and equipment, net 3,337 3,555    
Other assets and deferred charges 385 434    
Liabilities        
Current liabilities 829 887    
Consolidated Variable Interest Entities        
Assets        
Cash and cash equivalents 1 2    
Accounts receivable 430 39    
Other current assets 6 6    
Licenses 649 649    
Property, plant and equipment, net 87 93    
Other assets and deferred charges 264 15    
Total assets 1,437 804    
Liabilities        
Current liabilities 36 18    
Deferred liabilities and credits 12 12    
Total liabilities $ 48 $ 30