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Other Financial Data - Schedule of Other Non-current Liabilities (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Other Financial Data [Abstract]    
Taxes payable $ 576 $ 585
Leases 37 169
Deferred revenue 59 65
Compensation and benefits 49 56
Other 203 222
Total 924 1,097
Noncurrent portion of transition tax $ 221 $ 240