Income Taxes (Details 4) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Taxes
Undistributed foreign earnings, indefinitely reinvested for continued use in foreign operations	$ 25,000
Unrecognized Tax Benefits
Balance at the beginning of the period	421	$ 247	$ 1,140
Increase due to current year tax positions	187	115	195
Increase due to prior year tax positions	369	67
Decrease due to prior year tax positions	(15)	(6)
Lapse of statutes of limitations	(8)	(2)
Separation-related adjustments			(1,088)
Balance at the end of the period	954	421	247
Reimbursement receivable for unrecognized tax benefits and related interest and penalties for periods after separation	107
Net amount of potential tax benefits that would impact the entity's effective tax rate	901	389
Reasonably possible amount that gross unrecognized tax benefits may change within the next twelve months, high end of range	15
Interest and penalties	13	10	3
Accrued interest and penalties	$ 83	$ 25	$ 15

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Represents the amount of decrease in unrecognized tax benefits resulting from separation-related adjustments.

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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 undistributed earnings of foreign subsidiaries intended to be permanently reinvested outside the country of domicile.

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Amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns.

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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 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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