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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 $ 498 $ 586 $ 674 $ 715
Accounts receivable 691 658    
Other current assets 21 23    
Assets held for sale 5 8    
Licenses 2,225 1,886    
Property, plant and equipment, net 2,263 2,470    
Other assets and deferred charges 354 405    
Liabilities        
Current liabilities 673 718    
Consolidated Variable Interest Entities        
Assets        
Cash and cash equivalents 1 2    
Accounts receivable 433 44    
Other current assets 6 6    
Assets held for sale 3 2    
Licenses 652 652    
Property, plant and equipment, net 97 105    
Other assets and deferred charges 265 16    
Total assets 1,457 827    
Liabilities        
Current liabilities 39 21    
Deferred liabilities and credits 13 13    
Total liabilities $ 52 $ 34