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Variable Interest Entities, Consolidated Balance Sheet (Details) - USD ($)
$ in Millions
Jun. 30, 2017
Dec. 31, 2016
Jun. 30, 2016
Dec. 31, 2015
Assets        
Cash and cash equivalents $ 472 $ 586 $ 621 $ 715
Accounts receivable 664 658    
Other current assets 15 23    
Assets held for sale 4 8    
Licenses 2,226 1,886    
Property, plant and equipment, net 2,304 2,470    
Other assets and deferred charges 319 405    
Liabilities        
Current liabilities 651 718    
Consolidated Variable Interest Entities        
Assets        
Cash and cash equivalents 2 2    
Accounts receivable 404 44    
Other current assets 6 6    
Assets held for sale   2    
Licenses 655 652    
Property, plant and equipment, net 98 105    
Other assets and deferred charges 242 16    
Total assets 1,407 827    
Liabilities        
Current liabilities 42 21    
Deferred liabilities and credits 13 13    
Total liabilities $ 55 $ 34