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Variable Interest Entities (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Assets    
Cash and cash equivalents $ 352 $ 586
Accounts receivable 775 658
Other current assets 21 23
Assets held for sale 10 8
Licenses 2,223 1,886
Property, plant and equipment, net 2,320 2,470
Other assets and deferred charges 390 405
Liabilities    
Current liabilities 733 718
Consolidated Variable Interest Entities    
Assets    
Cash and cash equivalents 3 2
Accounts receivable 476 44
Other current assets 8 6
Assets held for sale 0 2
Licenses 655 652
Property, plant and equipment, net 99 105
Other assets and deferred charges 303 16
Total assets 1,544 827
Liabilities    
Current liabilities 39 21
Deferred liabilities and credits 13 13
Total liabilities $ 52 $ 34