Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Deferred tax assets
Deferred revenue	$ 306	$ 277
Net operating loss carry forwards	3,191	3,503
Property, plant and equipment	71	65
Other	267	343
Gross deferred tax assets	3,835	4,188
Less valuation allowance	(1,103)	(1,170)
Net deferred tax assets	2,732	3,018
Deferred tax liabilities
Deferred revenue	(14)	(34)
Property, plant and equipment	(1,295)	(1,264)
Intangible assets	(1,539)	(1,773)
Other	(20)	(33)
Gross deferred tax liabilities	(2,868)	(3,104)
Net deferred tax liabilities	$ (136)	$ (86)