Fair Value Measurements (Details BS Table) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Derivatives Fair Value [Line Items]
Time Deposits, at Carrying Value		$ 19
Cash	$ 167	135
Available-for-sale Securities	15	20
Derivative Instruments in Hedges, Liabilities, at Fair Value	69	7
Derivative Liabilities	90	26
Foreign Currency Contracts, Liability, Fair Value Disclosure	3,252	2,271
Debt Instrument, Fair Value Disclosure	5,945	5,739
Designated as Hedging Instrument [Member]
Derivatives Fair Value [Line Items]
Derivative Instruments in Hedges, Assets, at Fair Value	64	163
Designated as Hedging Instrument [Member] \| Prepaid Expenses and Other Current Assets [Member]
Derivatives Fair Value [Line Items]
Derivative Instruments in Hedges, Assets, at Fair Value	7
Designated as Hedging Instrument [Member] \| Other Current Liabilities [Member]
Derivatives Fair Value [Line Items]
Derivative Instruments in Hedges, Liabilities, at Fair Value	37	3
Designated as Hedging Instrument [Member] \| Other Noncurrent Liabilities [Member]
Derivatives Fair Value [Line Items]
Derivative Instruments in Hedges, Liabilities, at Fair Value		4
Designated as Hedging Instrument [Member] \| Other Noncurrent Assets [Member]
Derivatives Fair Value [Line Items]
Derivative Instruments in Hedges, Assets, at Fair Value	57
Not Designated as Hedging Instrument [Member]
Derivatives Fair Value [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Asset, at Fair Value	82	199
Not Designated as Hedging Instrument [Member] \| Prepaid Expenses and Other Current Assets [Member]
Derivatives Fair Value [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Asset, at Fair Value	18	36
Not Designated as Hedging Instrument [Member] \| Other Current Liabilities [Member]
Derivatives Fair Value [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Liability, at Fair Value	21	19
Currency hedge contracts [Member] \| Designated as Hedging Instrument [Member] \| Prepaid Expenses and Other Current Assets [Member]
Derivatives Fair Value [Line Items]
Derivative Instruments in Hedges, Assets, at Fair Value		98
Currency hedge contracts [Member] \| Designated as Hedging Instrument [Member] \| Other Long Term Assets [Member]
Derivatives Fair Value [Line Items]
Derivative Instruments in Hedges, Assets, at Fair Value		65
Currency hedge contracts [Member] \| Designated as Hedging Instrument [Member] \| Other Noncurrent Liabilities [Member]
Derivatives Fair Value [Line Items]
Derivative Instruments in Hedges, Liabilities, at Fair Value	33
Fair Value, Measurements, Recurring [Member]
Derivatives Fair Value [Line Items]
Money Market Funds, at Carrying Value	21	42
Cash	82	199
Available-for-sale Securities	15	20
Accrued Contingent Consideration	169	204
Assets, Fair Value Disclosure	118	261
Foreign Currency Contracts, Liability, Fair Value Disclosure	90	26
Financial and Nonfinancial Liabilities, Fair Value Disclosure	259	230
Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member]
Derivatives Fair Value [Line Items]
Money Market Funds, at Carrying Value	21	42
Cash	0	0
Available-for-sale Securities	15	20
Accrued Contingent Consideration	0	0
Assets, Fair Value Disclosure	36	62
Foreign Currency Contracts, Liability, Fair Value Disclosure	0	0
Financial and Nonfinancial Liabilities, Fair Value Disclosure	0	0
Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 3 [Member]
Derivatives Fair Value [Line Items]
Money Market Funds, at Carrying Value	0	0
Cash	0	0
Available-for-sale Securities	0	0
Accrued Contingent Consideration	169	204
Assets, Fair Value Disclosure	0	0
Foreign Currency Contracts, Liability, Fair Value Disclosure	0	0
Financial and Nonfinancial Liabilities, Fair Value Disclosure	169	204
Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member]
Derivatives Fair Value [Line Items]
Money Market Funds, at Carrying Value	0	0
Cash	82	199
Available-for-sale Securities	0	0
Accrued Contingent Consideration	0	0
Assets, Fair Value Disclosure	82	199
Foreign Currency Contracts, Liability, Fair Value Disclosure	90	26
Financial and Nonfinancial Liabilities, Fair Value Disclosure	$ 90	$ 26

Estimated discounted potential payments under contingent consideration arrangements.

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Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Excludes cash and cash equivalents within disposal group and discontinued operation.

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Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

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Aggregate fair value of all derivative assets designated as hedging instruments. Includes instruments designated as cash flow hedges, fair value hedges, and hedges of net investments in foreign operations.

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Aggregate fair value of all derivative liabilities designated as hedging instruments. Includes instruments designated as cash flow hedges, fair value hedges, and hedges of net investments in foreign operations.

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Fair value as of the balance sheet date of derivative instrument not designated as hedging instrument and classified as an asset.

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Fair value as of the balance sheet date of derivative instrument not designated as hedging instrument and classified as a liability.

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Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

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Fair value portion of asset contracts related to the exchange of different currencies, including, but not limited to, foreign currency options, forward contracts, and swaps.

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Fair value of financial and nonfinancial obligations.

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Investment in short-term money-market instruments (such as commercial paper, banker's acceptances, repurchase agreements, government securities, certificates of deposit, and so forth) which are highly liquid (that is, readily convertible to known amounts of cash) and so near their maturity that they present an insignificant risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify as cash equivalents by definition. Original maturity means an original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three-years ago does not become a cash equivalent when its remaining maturity is three months.

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Any certificate of deposit or savings account held by a bank or other financial institution for a short-term specified period of time. Because of their short-term, time deposits are considered highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three-years ago does not become a cash equivalent when its remaining maturity is three months.

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