Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Deferred tax assets:
Deferred and stock-based compensation	$ 82	$ 89
Pension	4	12
Liability reserve	38	35
Tax credits	2	3
Loss carryforward	129	138
Deferred revenue	22	24
Other	42	55
Total	319	356
Valuation allowance	(119)	(119)	$ (126)	$ (122)
Total deferred tax assets, net of valuation allowance	200	237
Deferred tax liabilities:
Property and equipment	(132)	(133)
Acquired intangibles	(2,382)	(2,439)
Total deferred tax liabilities	(2,514)	(2,572)
Net deferred tax liabilities	(2,314)	(2,335)	$ (2,295)
Reported as:
Net non-current deferred tax assets	0	2
Net non-current deferred tax liabilities	$ (2,314)	$ (2,337)