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Variable Interest Entities - Consolidataed Balance Sheet (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Jan. 01, 2019
Dec. 31, 2018
Assets      
Cash and cash equivalents $ 570   $ 580
Short-term investments 0   17
Accounts receivable 899   908
Inventory, net 139   142
Other current assets 19   34
Assets held for sale 9   54
Licenses 2,461   2,186
Property, plant and equipment, net 2,144   2,202
Operating lease right-of-use assets 897 $ 899 0
Other assets and deferred charges 539 567 579
Liabilities      
Current liabilities 849   691
Liabilities held for sale 1   1
Long-term operating lease liabilities 864 $ 878 0
Consolidated Variable Interest Entities      
Assets      
Cash and cash equivalents 29   9
Short-term investments 0   17
Accounts receivable 625   611
Inventory, net 4   5
Other current assets 6   6
Assets held for sale 0   4
Licenses 649   652
Property, plant and equipment, net 95   94
Operating lease right-of-use assets 42   0
Other assets and deferred charges 329   349
Total assets 1,779   1,747
Liabilities      
Current liabilities 34   34
Liabilities held for sale 0   1
Long-term operating lease liabilities 38   0
Other deferred liabilities and credits 13   16
Total liabilities $ 85   $ 51