Income Taxes - Deferred Tax Assets and Deferred Tax Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Deferred tax assets:
Net operating loss, capital loss and credits	$ 191	$ 173
Accruals and allowances	356	390
Stock-based compensation	12	10
Amortizable tax basis in intangibles	3,174	3,471
Net deferred tax assets	3,733	4,044
Valuation allowance	(136)	(149)
Deferred tax assets, net of valuation allowance	3,597	3,895
Deferred tax liabilities:
Outside basis differences	(3,136)	(2,165)
Acquisition-related intangibles	(37)	(36)
Depreciation and amortization	(202)	(219)
Net unrealized gain on investments	(84)	(307)
Deferred tax liabilities	(3,459)	(2,727)
Net deferred tax assets	$ 138	$ 1,168