Objectives and Strategies for Using Derivatives (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Assets	$ 54	$ 62
Liabilities	116	49
Fair value hedge ineffectiveness is immaterial assertion	Fair value hedges resulted in no significant ineffectiveness in each of the three years ended December 31, 2014
Gain from hedged firm commitment not qualifying as fair value hedge	0
Cash flow hedge ineffectiveness is immaterial assertion	Cash flow hedges resulted in no significant ineffectiveness in each of the three years ended December 31, 2014
Gains or losses reclassified into earnings resulting from discontinuance of cash flow hedges	0
Losses on undesignated foreign exchange hedging instruments recognized in other (income) and expense	192	74	(69)
Fair Value Hedging [Member]
Aggregate notional value	250
Cash Flow Hedging [Member]
Maximum maturity of cash flow hedges	Dec. 01, 2017
Not Designated as Hedging Instrument [Member]
Aggregate notional value	2,600
Foreign Exchange Contract [Member]
Assets	54	34
Liabilities	102	49
Foreign Exchange Contract [Member] \| Cash Flow Hedging [Member]
Aggregate notional value	820
Interest Rate Contract [Member]
Assets	0	22
Liabilities	4	0
Interest Rate Contract [Member] \| Cash Flow Hedging [Member]
Aggregate notional value	200
Commodity Contract [Member]
Assets	0	6
Liabilities	$ 10	$ 0

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Article 12

-Section 13

-Sentence Column B

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A disclosure of an assertion that the amount of cash flow hedge ineffectiveness is immaterial.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

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Fair value before 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.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 20

-Section 55

-Paragraph 7

-URI http://asc.fasb.org/extlink&oid=28370219&loc=SL20226000-175313

Reference 2: http://www.xbrl.org/2003/role/presentationRef

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Reference 3: http://www.xbrl.org/2003/role/presentationRef

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The amount of net gain (loss) reclassified into earnings in the period when cash flow hedge is discontinued because it is probable that the original forecasted transactions will not occur by the end of the original period or an additional two month time period.

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Amount of gain (loss) recognized in earnings in the period from the increase (decrease) in fair value of foreign currency derivatives not designated as hedging instruments.

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