Income Taxes - Unrecognized Tax Benefits (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Unrecognized Tax Benefits
Beginning balance	$ 2,701	$ 1,168	$ 954
Increase due to current year tax positions	163	1,768	118
Increase due to prior year tax positions	110	16	111
Decrease due to prior year tax positions	(36)	(2)	(7)
Settlements	(79)	(233)	0
Lapse of statutes of limitations	(7)	(16)	(8)
Ending balance	2,852	2,701	1,168
Net amount of potential tax benefits that would impact the entity's effective tax rate	2,700	2,600
Reimbursement receivable for unrecognized tax benefits and related interest and penalties for periods after separation	84
Interest and penalties	73	24	35
Accrued interest and penalties	190	$ 120	$ 112
Reasonably possible amount that gross unrecognized tax benefits may change within the next twelve months, high end of range	$ 486

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.

+ References

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-Publisher FASB
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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.

+ References

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

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- Definition

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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