Financing arrangements (Details) (USD $) In Millions	Jun. 30, 2011	Dec. 31, 2010
Carrying value of long-term borrowings
Convertible notes current	$ 83	$ 2,488
Convertible notes	2,279	2,296
Notes payable	11,568	8,578
Other notes including our zero coupon convertible notes	183	183
Total borrowings	13,930	13,362
Less current portion	(83)	(2,488)
Total non-current debt	13,847	10,874
0.125% convertible notes due 2011 (2011 Convertible notes) [Member]
Carrying value of long-term borrowings
Convertible notes current	0	2,488
Less current portion	0	(2,488)
0.375% convertible notes due 2013 (2013 Convertible notes) [Member]
Carrying value of long-term borrowings
Convertible notes	2,279	2,213
5.65% notes due 2042 (2042 Notes) [Member]
Carrying value of long-term borrowings
Notes payable	1,244	0
5.85% notes due 2017 (2017 Notes) [Member]
Carrying value of long-term borrowings
Notes payable	1,099	1,099
4.85% notes due 2014 (2014 Notes) [Member]
Carrying value of long-term borrowings
Notes payable	1,000	1,000
5.70% notes due 2019 (2019 Notes) [Member]
Carrying value of long-term borrowings
Notes payable	998	998
4.10% notes due 2021 (2021 Notes) [Member]
Carrying value of long-term borrowings
Notes payable	997	0
6.40% notes due 2039 (2039 Notes) [Member]
Carrying value of long-term borrowings
Notes payable	996	996
6.375% notes due 2037 (2037 Notes) [Member]
Carrying value of long-term borrowings
Notes payable	899	899
3.45% notes due October 2020 (October 2020 Notes) [Member]
Carrying value of long-term borrowings
Notes payable	897	897
2.30% notes due 2016 (2016 Notes) [Member]
Carrying value of long-term borrowings
Notes payable	748	0
5.75% notes due 2040 (2040 Notes) [Member]
Carrying value of long-term borrowings
Notes payable	697	696
4.95% notes due 2041 (2041 Notes) [Member]
Carrying value of long-term borrowings
Notes payable	595	595
6.15% notes due 2018 (2018 Notes) [Member]
Carrying value of long-term borrowings
Notes payable	499	499
6.90% notes due 2038 (2038 Notes) [Member]
Carrying value of long-term borrowings
Notes payable	499	499
4.50% notes due March 2020 (March 2020 Notes) [Member]
Carrying value of long-term borrowings
Notes payable	$ 300	$ 300

The portion of the carrying value of long-term convertible debt as of the balance sheet date that is scheduled to be repaid within one year or in the normal operating cycle if longer. The debt is convertible into another form of financial instrument, typically the entity's common stock.

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- Definition

Carrying value of the current and noncurrent portion of notes payable which were initially due after one year or beyond the normal operating cycle, if longer, and which are not otherwise defined in the taxonomy.

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- Definition

Carrying amount of long-term convertible debt as of the balance sheet date, net of the amount due in the next twelve months or greater than the normal operating cycle, if longer. The debt is convertible into another form of financial instrument, typically the entity's common stock.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 22
-Article 5

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date. May include notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, which had initial maturities beyond one year or beyond the normal operating cycle, if longer, and after deducting unamortized discount or premiums, if any.

+ 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 210.5-02.22)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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 210.9-03.16)
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 7
-Section 03
-Paragraph 16

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.16)
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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-Publisher SEC
-Name Regulation S-X (SX)
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-Section 03
-Paragraph 16
-Article 9

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 20, 22
-Article 5

+ Details

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- Details

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- Definition

Sum of the carrying values as of the balance sheet date of all long-term debt, which is debt initially having maturities due after one year from the balance sheet date or beyond the operating cycle, if longer, but excluding the portions thereof scheduled to be repaid within one year (current maturities) or the normal operating cycle, if longer, and after deducting unamortized discount or premiums, if any.

+ References

+ Details

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- Definition

Carrying value as of the balance sheet date of notes payable (with maturities initially due after one year or beyond the operating cycle if longer), excluding current portion.

+ References

+ Details

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