Receivables (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2013 Customers Countries	Dec. 31, 2012 Customers Countries	Dec. 31, 2011
Concentration Risk [Line Items]
Maximum Percentage Gross Trade Receivables From One Geographic Segment	10.00%	10.00%
Maximum Percentage Gross Trade Receivables From One Customer	10.00%	10.00%
Allowance for Doubtful Accounts Receivable [Roll Forward]
Balance at Beginning of Period	$ 92	$ 137	$ 91
Charged to Costs and Expenses	39	(40)	53
Write-Offs	(14)	(5)	(7)
Balance at End of Period	117	92	137
NumberOfCountriesExceedReceivablesThreshold	0	0
NumberOfCustomersExceedReceivablesThreshold	0	0
Geographic Concentration Risk \| UNITED STATES \| Accounts Receivable
Concentration Risk [Line Items]
Concentration Risk, Percentage (in hundredths)		36.00%
UNITED STATES \| Accounts Receivable
Concentration Risk [Line Items]
Concentration Risk, Percentage (in hundredths)	34.00%
VENEZUELA
Concentration Risk [Line Items]
Accounts Receivable, Gross	486	491
Accounts Receivable, Gross, Noncurrent	$ 183	$ 143
VENEZUELA \| Accounts Receivable
Concentration Risk [Line Items]
Concentration Risk, Percentage (in hundredths)	8.00%	9.00%

The maximum percentage of gross trade receivables from one customer at balance sheet date.

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- Definition

The maximum percentage of gross trade receivables from one geographic segment at balance sheet date.

+ References

No definition available.

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- Definition

Number Of Countries Exceed Receivables Threshold of 10%

+ References

No definition available.

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- Definition

Number Of Customers Exceed Receivables Threshold of 10%

+ References

No definition available.

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- Definition

For unclassified balance sheet, amounts due from customers or clients for goods or services that have been delivered or sold in the normal course of business.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 3

-Article 5

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.9)

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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- Definition

Amounts due from customers or clients, more than one year from the balance sheet date, for goods or services that have been delivered or sold in the normal course of business.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.17)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 3

-Article 5

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- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 21

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13537-108611

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 275

-SubTopic 10

-Section 50

-Paragraph 20

-URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6404-108592

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 20

-URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13531-108611

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 275

-SubTopic 10

-Section 50

-Paragraph 18

-URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6351-108592

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- Definition

Total of allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 4

-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 09

-Article 12

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- Definition

Total of the deductions in a given period to allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs, representing receivables written off as uncollectible and portions of the reserves utilized, respectively.

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