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Variable Interest Entities - Consolidated Balance Sheet (Details) - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
Assets    
Cash and cash equivalents $ 1,062 $ 619
Accounts receivable 930 861
Other current assets 30 27
Licenses 2,198 2,232
Property, plant and equipment, net 3,229 3,424
Other assets and deferred charges 594 422
Liabilities    
Current liabilities 852 918
Consolidated Variable Interest Entities    
Assets    
Cash and cash equivalents 24 3
Accounts receivable 582 473
Other current assets 8 7
Licenses 647 648
Property, plant and equipment, net 83 89
Other assets and deferred charges 324 304
Total assets 1,668 1,524
Liabilities    
Current liabilities 28 36
Deferred liabilities and credits 13 12
Total liabilities $ 41 $ 48