XML 85 R51.htm IDEA: XBRL DOCUMENT v3.10.0.1
Intangible Assets (Details) - Licenses
$ in Millions
9 Months Ended
Sep. 30, 2018
USD ($)
Licenses  
Balance, beginning of period $ 2,232
Acquisitions 2
Transferred to Assets held for sale (42)
Divestitures (11)
Exchanges - Licenses received 18
Exchanges - Licenses surrendered (1)
Balance, end of period $ 2,198