Income Taxes - Deferred Income Tax Assets and Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Deferred tax assets:
Loss carryforwards U.S. - Federal/States	$ 188	$ 222
Loss carryforwards - Foreign	3,232	2,551
Accrued liabilities, reserves, and other expenses	1,373	1,064
Stock-based compensation	1,585	1,293
Depreciation and amortization	2,385	2,386
Operating lease liabilities	6,648	0
Other items	728	484
Tax credits	772	734
Total gross deferred tax assets	16,911	8,734
Less valuation allowance	(5,754)	(4,950)
Deferred tax assets, net of valuation allowances	11,157	3,784
Deferred tax liabilities:
Depreciation and amortization	(5,507)	(3,579)
Operating lease assets	(6,331)	0
Other items	(640)	(749)
Net deferred tax liabilities, net of valuation allowance	$ (1,321)	$ (544)