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Derivative Financial Instruments (Details) (Forward Contracts [Member]) In Millions	Jun. 30, 2011 RUB	Jun. 30, 2011 NOK	Jun. 30, 2011 USD ($)	Jun. 30, 2011 SGD	Jun. 30, 2011 JPY (¥)	Jun. 30, 2011 DKK	Jun. 30, 2011 BRL	Jun. 30, 2011 GBP (£)	Jun. 30, 2011 EUR (€)	Dec. 31, 2010 RUB	Dec. 31, 2010 NOK	Dec. 31, 2010 USD ($)	Dec. 31, 2010 SGD	Dec. 31, 2010 DKK	Dec. 31, 2010 GBP (£)	Dec. 31, 2010 EUR (€)
Outstanding Foreign Currency Forward Contracts
Foreign currency, Cash flow hedging		5,274	$ 379	5	¥ 122	74		£ 12	€ 262		4,983	$ 247	0	31	£ 4	€ 122
Foreign currency, Fair value hedging			0									1
Foreign currency, Non-designated hedging	711	1,130	$ 635	37	¥ 244	48	38	£ 6	€ 72	780	1,442	$ 328	0	115	£ 8	€ 97

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Outstanding Foreign Currency Forward Contracts.

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Fair value as of the balance sheet date of all foreign currency derivatives designated as cash flow hedging instruments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 107
-Paragraph 10
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4B
-Subparagraph (a),(b),(c)(1)
-URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5624163-113959

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Fair value as of the balance sheet date of all derivatives designated as foreign currency fair value hedging instruments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 107
-Paragraph 10
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958

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Net fair value of all derivative instruments not designated as a hedging instrument.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 107
-Paragraph 10
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6947722&loc=d3e13433-108611

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=6947722&loc=d3e13495-108611

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