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Variable Interest Entities - Consolidated Balance Sheet (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Jan. 01, 2019
Dec. 31, 2018
Assets      
Cash and cash equivalents $ 959   $ 921
Short-term investments 17   17
Accounts receivable 968   992
Inventory, net 165   150
Other current assets 28   28
Licenses 2,222   2,195
Property, plant and equipment, net 3,282   3,346
Operating lease right-of-use assets 965 $ 975 0
Other assets and deferred charges 720 604 616
Liabilities      
Current liabilities 965   879
Long-term operating lease liabilities 929 $ 949 0
Consolidated Variable Interest Entities      
Assets      
Cash and cash equivalents 8   9
Short-term investments 17   17
Accounts receivable 617   609
Inventory, net 4   5
Other current assets 5   5
Licenses 647   647
Property, plant and equipment, net 85   88
Operating lease right-of-use assets 37   0
Other assets and deferred charges 338   347
Total assets 1,758   1,727
Liabilities      
Current liabilities 34   31
Long-term operating lease liabilities 34   0
Deferred liabilities and credits 12   15
Total liabilities $ 80   $ 46