Financial Information for Guarantor Subsidiaries and Non-Guarantor Subsidiaries - Supplemental Condensed Consolidating Balance Sheet (Details) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018
Assets [Abstract]
Cash and cash equivalents	$ 790	$ 313
Restricted cash	63	51
Receivables, net of allowance for credit losses $74 and $36, respectively	612	755
Inventories	233	244
Prepaid expenses, deposits and other current assets	234	252
Property and equipment, net	447	500
Operating lease right-of-use assets	96	105
Goodwill	3,211	3,280
Intangible assets, net	1,397	1,516
Software, net	240	258
Total assets	7,844	7,809
Liabilities and Equity [Abstract]
Debt, Current	384	45
Long-term Debt and Lease Obligation	8,769	8,680
Operating lease liabilities	80	88
Stockholders' Equity Attributable to Parent	(2,593)	(2,212)	$ (2,118)	$ (2,423)	$ (2,463)
Stockholders' Equity Attributable to Noncontrolling Interest		104
Liabilities and Equity, Total	7,844	7,809
Non-current restricted cash	$ 11	$ 11