Fair Value Measurements (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Fair Value of Derivative Assets	$ 1,204,000,000	$ 859,000,000
Fair Value of Derivative Liabilities	297,000,000	167,000,000
Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Cash equivalents - financial instruments	400,000,000	351,000,000
Marketable securities	6,264,000,000	3,258,000,000
Fair Value of Derivative Assets	1,204,000,000	859,000,000
Total assets at fair value	7,868,000,000	4,468,000,000
Fair Value of Derivative Liabilities	297,000,000	167,000,000
Total liabilities at fair value	297,000,000	167,000,000
Fair Value, Measurements, Recurring [Member] \| Cash Equivalents [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Par value assets excluded from fair value by input	5,100,000,000	3,800,000,000
Fair Value, Measurements, Recurring [Member] \| Cash [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Par value assets excluded from fair value by input	1,800,000,000	2,000,000,000
Fair Value, Measurements, Recurring [Member] \| Foreign Government and Agencies [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Cash equivalents - financial instruments	320,000,000	341,000,000
Marketable securities	521,000,000	405,000,000
Fair Value, Measurements, Recurring [Member] \| Corporate debt [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Cash equivalents - financial instruments	80,000,000	10,000,000
Marketable securities	1,706,000,000	1,555,000,000
Fair Value, Measurements, Recurring [Member] \| US Treasury and Government [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Marketable securities	4,006,000,000	1,268,000,000
Fair Value, Measurements, Recurring [Member] \| Other Marketable Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Marketable securities	31,000,000	30,000,000
Fair Value, Measurements, Recurring [Member] \| Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Cash equivalents - financial instruments	0	0
Marketable securities	1,151,000,000	17,000,000
Fair Value of Derivative Assets	0	0
Total assets at fair value	1,151,000,000	17,000,000
Fair Value of Derivative Liabilities	0	0
Total liabilities at fair value	0	0
Fair Value, Measurements, Recurring [Member] \| Level 1 [Member] \| Foreign Government and Agencies [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Cash equivalents - financial instruments	0	0
Marketable securities	0	0
Fair Value, Measurements, Recurring [Member] \| Level 1 [Member] \| Corporate debt [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Cash equivalents - financial instruments	0	0
Marketable securities	0	0
Fair Value, Measurements, Recurring [Member] \| Level 1 [Member] \| US Treasury and Government [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Marketable securities	1,151,000,000	17,000,000
Fair Value, Measurements, Recurring [Member] \| Level 1 [Member] \| Other Marketable Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Marketable securities	0	0
Fair Value, Measurements, Recurring [Member] \| Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Cash equivalents - financial instruments	400,000,000	351,000,000
Marketable securities	5,113,000,000	3,241,000,000
Fair Value of Derivative Assets	1,204,000,000	859,000,000
Total assets at fair value	6,717,000,000	4,451,000,000
Fair Value of Derivative Liabilities	297,000,000	167,000,000
Total liabilities at fair value	297,000,000	167,000,000
Fair Value, Measurements, Recurring [Member] \| Level 2 [Member] \| Foreign Government and Agencies [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Cash equivalents - financial instruments	320,000,000	341,000,000
Marketable securities	521,000,000	405,000,000
Fair Value, Measurements, Recurring [Member] \| Level 2 [Member] \| Corporate debt [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Cash equivalents - financial instruments	80,000,000	10,000,000
Marketable securities	1,706,000,000	1,555,000,000
Fair Value, Measurements, Recurring [Member] \| Level 2 [Member] \| US Treasury and Government [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Marketable securities	2,855,000,000	1,251,000,000
Fair Value, Measurements, Recurring [Member] \| Level 2 [Member] \| Other Marketable Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Marketable securities	$ 31,000,000	$ 30,000,000

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Represent assets stated at par value, which approximate fair value and thus excluded from the fair value schedule by input.

+ References

No definition available.

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- Definition

This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value on a recurring basis by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements.

+ References

No definition available.

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- Definition

Fair value portion 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. Also includes short-term, 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.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Cash

-URI http://asc.fasb.org/extlink&oid=6506951

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-Publisher FASB

-Name Accounting Standards Codification

-Glossary Cash Equivalents

-URI http://asc.fasb.org/extlink&oid=6507016

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- Definition

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. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 20

-Section 50

-Paragraph 3

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=34720828&loc=SL20225862-175312

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-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4B

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-Topic 210

-SubTopic 20

-Section 55

-Paragraph 7

-URI http://asc.fasb.org/extlink&oid=36459792&loc=SL20226000-175313

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- Definition

Fair value, before 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 elected not to be offset. Excludes liabilities not subject to a master netting arrangement.

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- Definition

Fair value of obligations measured on a recurring basis.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (a),(b)

-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258

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- Definition

Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Available-for-Sale Securities

-URI http://asc.fasb.org/extlink&oid=6505594

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-Publisher FASB

-Name Accounting Standards Codification

-Glossary Trading Securities

-URI http://asc.fasb.org/extlink&oid=6526789

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 25

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Subparagraph a, f, g

-Article 7

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 35

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=27723805&loc=d3e24584-111560

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