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Variable Interest Entities - Classification (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Assets    
Cash and cash equivalents $ 921 $ 619
Short-term investments 17 100
Accounts receivable 992 861
Inventory, net 150 145
Other current assets 28 27
Licenses 2,195 2,232
Property, plant and equipment, net 3,346 3,424
Other assets and deferred charges 616 422
Liabilities    
Current liabilities 879 918
Consolidated Variable Interest Entities    
Assets    
Cash and cash equivalents 9 3
Short-term investments 17 0
Accounts receivable 609 473
Inventory, net 5 4
Other current assets 5 3
Licenses 647 648
Property, plant and equipment, net 88 89
Other assets and deferred charges 347 304
Total assets 1,727 1,524
Liabilities    
Current liabilities 31 36
Deferred liabilities and credits 15 12
Total liabilities $ 46 $ 48