Income Taxes - Unrecognized Tax Benefits (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Unrecognized Tax Benefits
Beginning balance	$ 2,852	$ 2,701	$ 1,168
Increase due to current year tax positions	113	163	1,768
Increase due to prior year tax positions	499	110	16
Decrease due to prior year tax positions	(21)	(36)	(2)
Settlements	(749)	(79)	(233)
Lapse of statutes of limitations	(33)	(7)	(16)
Ending balance	2,661	2,852	2,701
Net amount of potential tax benefits that would impact the entity's effective tax rate	2,400	2,700
Reimbursement receivable for unrecognized tax benefits and related interest and penalties for periods after separation	83
Interest and penalties	51	73	24
Accrued interest and penalties	191	$ 190	$ 120
Reasonably possible amount that gross unrecognized tax benefits may change within the next twelve months, high end of range	$ 54

Represents the amount of reimbursement receivable for unrecognized tax benefits and related interest and penalties.

No definition available.

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- Definition

Amount of decrease reasonably possible in the next twelve months for the unrecognized tax benefit.

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

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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 decrease in unrecognized tax benefits resulting from settlements with taxing authorities.

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Amount accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return.

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Amount of expense for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return.

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

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Amount of decrease in unrecognized tax benefits resulting from lapses of applicable statutes of limitations.

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The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate.

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