Fair Value Measurements (Details BS Table) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Derivatives Fair Value [Line Items]
Derivative Assets	$ 444us-gaap_DerivativeAssets	$ 265us-gaap_DerivativeAssets
Derivative Liabilities	36us-gaap_DerivativeLiabilities	63us-gaap_DerivativeLiabilities
Designated as Hedging Instrument [Member]
Derivatives Fair Value [Line Items]
Derivative Instruments in Hedges, Assets, at Fair Value	344	238
Derivative Instruments in Hedges, Liabilities, at Fair Value	1	40
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	100	27
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	35	23
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	178	117
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	141	120
Currency hedge contracts [Member] \| Designated as Hedging Instrument [Member] \| Other Current Liabilities [Member]
Derivatives Fair Value [Line Items]
Derivative Instruments in Hedges, Liabilities, at Fair Value	1	13
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	0	19
Interest Rate Contract [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	3	1
Interest Rate Contract [Member] \| Designated as Hedging Instrument [Member] \| Other Long Term Assets [Member]
Derivatives Fair Value [Line Items]
Derivative Instruments in Hedges, Assets, at Fair Value	22	0
Interest Rate Contract [Member] \| Designated as Hedging Instrument [Member] \| Other Noncurrent Liabilities [Member]
Derivatives Fair Value [Line Items]
Derivative Instruments in Hedges, Liabilities, at Fair Value	$ 0	$ 8

Fair value, after the effects of master netting arrangements, of a financial asset or other 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 assets not subject to a master netting arrangement and not elected to be offset.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

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-Publisher FASB

-Name Accounting Standards Codification

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-Name Accounting Standards Codification

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