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Variable Interest Entities, Consolidated Balance Sheet (Details) - USD ($)
$ in Millions
Mar. 31, 2018
Dec. 31, 2017
Assets    
Cash and cash equivalents $ 779 $ 619
Accounts receivable 867 861
Other current assets 42 27
Licenses 2,240 2,232
Property, plant and equipment, net 3,335 3,424
Other assets and deferred charges 587 422
Liabilities    
Current liabilities 750 918
Consolidated Variable Interest Entities    
Assets    
Cash and cash equivalents 1 3
Accounts receivable 541 473
Other current assets 7 7
Licenses 648 648
Property, plant and equipment, net 86 89
Other assets and deferred charges 320 304
Total assets 1,603 1,524
Liabilities    
Current liabilities 29 36
Deferred liabilities and credits 13 12
Total liabilities $ 42 $ 48