Income Taxes - Schedule of Unrecognized Tax Benefits (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Reconciliation of Unrecognized Tax Benefits
Gross unrecognized tax benefits ‑ beginning of period	$ 4,678	$ 3,870	$ 3,309
Increases related to prior year tax positions	2,309	457	72
Decreases related to prior year tax positions	(525)	(396)	(34)
Increases related to current year tax positions	1,402	831	536
Decreases related to settlements of prior year tax positions	(1)	(84)	(13)
Gross unrecognized tax benefits ‑ end of period	$ 7,863	$ 4,678	$ 3,870

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

No definition available.

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- Definition

Amount of unrecognized tax benefits.

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Amount of decrease in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.

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Amount of increase in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return.

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