Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Deferred tax assets:
Net operating loss carryforward	$ 2,051	$ 1,825
Tax credit carryforward	1,333	668
Share-based compensation	135	270
Accrued expenses and other liabilities	798	487
Lease liabilities	1,999
Other	149	153
Total deferred tax assets	6,465	3,403
Less: valuation allowance	(1,012)	(600)
Deferred tax assets, net of valuation allowance	5,453	2,803
Deferred tax liabilities:
Depreciation and amortization	(2,387)	(1,401)
Right-of-use assets	(1,910)
Purchased intangible assets	0	(195)
Total deferred tax liabilities	(4,297)	(1,596)
Net deferred tax assets	$ 1,156	$ 1,207