Income Taxes - Significant Components of Deferred Tax Assets and Liability (Detail) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Deferred tax assets:
Allowances and operating liabilities	$ 318	$ 395
Net operating loss carryforwards	387	270
Stock Compensation	61	69
Tax credit carryforwards	411	702
Other	122	60
Valuation allowance	(1,093)	(1,175)
Total deferred tax assets	206	321
Deferred tax liabilities:
Tax over book depreciation	60	115
Capital leases	80	86
Intangible assets	49	110
Deferred income	47	65
Accrued tax on unremitted earnings	33	33
Other	15	52
Total deferred tax liabilities	284	461
Net deferred tax liability	$ 78	$ 140