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Financing arrangements (Details Textual)
Share data in Millions, except Per Share data, unless otherwise specified |
12 Months Ended | 1 Months Ended | 12 Months Ended | 12 Months Ended | 12 Months Ended | 12 Months Ended | 12 Months Ended | 12 Months Ended | 12 Months Ended | 12 Months Ended | 12 Months Ended | 12 Months Ended | 12 Months Ended | 12 Months Ended | 12 Months Ended | 12 Months Ended | 12 Months Ended | 12 Months Ended | 12 Months Ended | 12 Months Ended | 12 Months Ended | 12 Months Ended | 12 Months Ended | 12 Months Ended | 12 Months Ended | 12 Months Ended | 12 Months Ended | 12 Months Ended | 12 Months Ended | 1 Months Ended | |||||||||||||||||||||||||||||||||||||||||||||||||||
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Dec. 31, 2012
USD ($)
|
Dec. 31, 2011
USD ($)
|
Dec. 31, 2010
USD ($)
|
Feb. 28, 2011
0.125% convertible notes due 2011 (0.125% 2011 Convertible Notes) [Member]
USD ($)
|
Dec. 31, 2011
0.125% convertible notes due 2011 (0.125% 2011 Convertible Notes) [Member]
USD ($)
|
Dec. 31, 2010
0.125% convertible notes due 2011 (0.125% 2011 Convertible Notes) [Member]
USD ($)
|
Dec. 31, 2012
0.375% convertible notes due 2013 (0.375% 2013 Convertible Notes) [Member]
USD ($)
|
Dec. 31, 2011
0.375% convertible notes due 2013 (0.375% 2013 Convertible Notes) [Member]
USD ($)
|
Dec. 31, 2010
0.375% convertible notes due 2013 (0.375% 2013 Convertible Notes) [Member]
USD ($)
|
Dec. 31, 2012
1.875% notes due 2014 (1.875% 2014 Notes) [Member]
USD ($)
|
Dec. 31, 2011
1.875% notes due 2014 (1.875% 2014 Notes) [Member]
USD ($)
|
Dec. 31, 2012
4.85% notes due 2014 (4.85% 2014 Notes) [Member]
USD ($)
|
Dec. 31, 2011
4.85% notes due 2014 (4.85% 2014 Notes) [Member]
USD ($)
|
Dec. 31, 2012
2.30% notes due 2016 (2.30% 2016 Notes) [Member]
USD ($)
|
Dec. 31, 2011
2.30% notes due 2016 (2.30% 2016 Notes) [Member]
USD ($)
|
Dec. 31, 2012
2.50% notes due 2016 (2.50% 2016 Notes) [Member]
USD ($)
|
Dec. 31, 2011
2.50% notes due 2016 (2.50% 2016 Notes) [Member]
USD ($)
|
Dec. 31, 2012
2.125% notes due 2017 (2.125% 2017 Notes) [Member]
USD ($)
|
Dec. 31, 2011
2.125% notes due 2017 (2.125% 2017 Notes) [Member]
USD ($)
|
Dec. 31, 2012
5.85% notes due 2017 (5.85% 2017 Notes) [Member]
USD ($)
|
Dec. 31, 2011
5.85% notes due 2017 (5.85% 2017 Notes) [Member]
USD ($)
|
Dec. 31, 2012
6.15% notes due 2018 (6.15% 2018 Notes) [Member]
USD ($)
|
Dec. 31, 2011
6.15% notes due 2018 (6.15% 2018 Notes) [Member]
USD ($)
|
Dec. 31, 2012
4.375% euro denominated notes due 2018 (4.375% 2018 euro Notes) [Member]
USD ($)
|
Dec. 31, 2011
4.375% euro denominated notes due 2018 (4.375% 2018 euro Notes) [Member]
USD ($)
|
Dec. 31, 2011
4.375% euro denominated notes due 2018 (4.375% 2018 euro Notes) [Member]
EUR (€)
|
Dec. 31, 2012
5.70% notes due 2019 (5.70% 2019 Notes) [Member]
USD ($)
|
Dec. 31, 2011
5.70% notes due 2019 (5.70% 2019 Notes) [Member]
USD ($)
|
Dec. 31, 2012
2.125% euro denominated notes due 2019 (2.125% 2019 euro Notes) [Member]
USD ($)
|
Dec. 31, 2012
2.125% euro denominated notes due 2019 (2.125% 2019 euro Notes) [Member]
EUR (€)
|
Dec. 31, 2011
2.125% euro denominated notes due 2019 (2.125% 2019 euro Notes) [Member]
USD ($)
|
Dec. 31, 2012
4.50% notes due 2020 (4.50% 2020 Notes) [Member]
USD ($)
|
Dec. 31, 2011
4.50% notes due 2020 (4.50% 2020 Notes) [Member]
USD ($)
|
Dec. 31, 2012
3.45% notes due 2020 (3.45% 2020 Notes) [Member]
USD ($)
|
Dec. 31, 2011
3.45% notes due 2020 (3.45% 2020 Notes) [Member]
USD ($)
|
Dec. 31, 2012
4.10% notes due 2021 (4.10% 2021 Notes) [Member]
USD ($)
|
Dec. 31, 2011
4.10% notes due 2021 (4.10% 2021 Notes) [Member]
USD ($)
|
Dec. 31, 2012
3.875% notes due 2021 (3.875% 2021 Notes) [Member]
USD ($)
|
Dec. 31, 2011
3.875% notes due 2021 (3.875% 2021 Notes) [Member]
USD ($)
|
Dec. 31, 2012
3.625% notes due 2022 (3.625% 2022 Notes) [Member]
USD ($)
|
Dec. 31, 2011
3.625% notes due 2022 (3.625% 2022 Notes) [Member]
USD ($)
|
Dec. 31, 2012
5.50% pound sterling denominated notes due 2026 (5.50% 2026 pound sterling Notes) [Member]
USD ($)
|
Dec. 31, 2011
5.50% pound sterling denominated notes due 2026 (5.50% 2026 pound sterling Notes) [Member]
USD ($)
|
Dec. 31, 2011
5.50% pound sterling denominated notes due 2026 (5.50% 2026 pound sterling Notes) [Member]
GBP (£)
|
Dec. 31, 2012
4.00% pound sterling denominated notes due 2029 (4.00% 2029 pound sterling Notes) [Member]
USD ($)
|
Dec. 31, 2012
4.00% pound sterling denominated notes due 2029 (4.00% 2029 pound sterling Notes) [Member]
GBP (£)
|
Dec. 31, 2011
4.00% pound sterling denominated notes due 2029 (4.00% 2029 pound sterling Notes) [Member]
USD ($)
|
Dec. 31, 2012
6.375% notes due 2037 (6.375% 2037 Notes) [Member]
USD ($)
|
Dec. 31, 2011
6.375% notes due 2037 (6.375% 2037 Notes) [Member]
USD ($)
|
Dec. 31, 2012
6.90% notes due 2038 (6.90% 2038 Notes) [Member]
USD ($)
|
Dec. 31, 2011
6.90% notes due 2038 (6.90% 2038 Notes) [Member]
USD ($)
|
Dec. 31, 2012
6.40% notes due 2039 (6.40% 2039 Notes) [Member]
USD ($)
|
Dec. 31, 2011
6.40% notes due 2039 (6.40% 2039 Notes) [Member]
USD ($)
|
Dec. 31, 2012
5.75% notes due 2040 (5.75% 2040 Notes) [Member]
USD ($)
|
Dec. 31, 2011
5.75% notes due 2040 (5.75% 2040 Notes) [Member]
USD ($)
|
Dec. 31, 2012
4.95% notes due 2041 (4.95% 2041 Notes) [Member]
USD ($)
|
Dec. 31, 2011
4.95% notes due 2041 (4.95% 2041 Notes) [Member]
USD ($)
|
Dec. 31, 2012
5.15% notes due 2041 (5.15% 2041 Notes) [Member]
USD ($)
|
Dec. 31, 2011
5.15% notes due 2041 (5.15% 2041 Notes) [Member]
USD ($)
|
Dec. 31, 2012
5.65% notes due 2042 (5.65% 2042 Notes) [Member]
USD ($)
|
Dec. 31, 2011
5.65% notes due 2042 (5.65% 2042 Notes) [Member]
USD ($)
|
Dec. 31, 2012
5.375% notes due 2043 (5.375% 2043 Notes) [Member]
USD ($)
|
Dec. 31, 2011
5.375% notes due 2043 (5.375% 2043 Notes) [Member]
USD ($)
|
Dec. 31, 2012
Warrants Issued Concurrent with Issuance of 2011 and 2013 Convertible Debt [Member]
|
Dec. 31, 2006
Convertible notes [Member]
USD ($)
|
Dec. 31, 2011
Zero coupon convertible notes due in 2032 [Member]
USD ($)
|
Dec. 31, 2012
8.125% notes due 2097 (Other) [Member]
USD ($)
|
Dec. 31, 2011
8.125% notes due 2097 (Other) [Member]
USD ($)
|
Dec. 31, 2012
Commercial Paper [Member]
USD ($)
|
Dec. 31, 2011
Commercial Paper [Member]
USD ($)
|
Dec. 31, 2012
Line of Credit [Member]
USD ($)
extension
|
Dec. 31, 2011
Line of Credit [Member]
USD ($)
|
Dec. 31, 2011
Rate Adjustment To Libor On Interest Rate Swap Agreements [Member]
|
Dec. 31, 2010
Rate Adjustment To Libor On Interest Rate Swap Agreements [Member]
|
Dec. 31, 2012
Interest Rate Swap [Member]
USD ($)
|
Feb. 27, 2013
Subsequent Event [Member]
0.375% convertible notes due 2013 (0.375% 2013 Convertible Notes) [Member]
USD ($)
|
Feb. 27, 2013
Subsequent Event [Member]
Repayment of Debt [Member]
0.375% convertible notes due 2013 (0.375% 2013 Convertible Notes) [Member]
USD ($)
|
Feb. 27, 2013
Excess Conversion Value [Member]
Subsequent Event [Member]
0.375% convertible notes due 2013 (0.375% 2013 Convertible Notes) [Member]
USD ($)
|
Dec. 31, 2012
MN [Member]
USD ($)
|
Dec. 31, 2012
Shelf Registration Statement [Member]
Medium-term Notes [Member]
USD ($)
|
Dec. 31, 2011
Shelf Registration Statement [Member]
Medium-term Notes [Member]
USD ($)
|
|
| Financing arrangements (Textual) [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Repayment of debt | $ 123,000,000 | $ 2,500,000,000 | $ 0 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Stated contractual interest rate on note | 0.125% | 0.375% | 0.375% | 1.875% | 1.875% | 4.85% | 4.85% | 2.30% | 2.30% | 2.50% | 2.50% | 2.125% | 5.85% | 5.85% | 6.15% | 6.15% | 4.375% | 4.375% | 4.375% | 5.70% | 5.70% | 2.125% | 2.125% | 4.50% | 4.50% | 3.45% | 3.45% | 4.10% | 4.10% | 3.875% | 3.875% | 3.625% | 5.50% | 5.50% | 5.50% | 4.00% | 4.00% | 6.375% | 6.375% | 6.90% | 6.90% | 6.40% | 6.40% | 5.75% | 5.75% | 4.95% | 4.95% | 5.15% | 5.15% | 5.65% | 5.65% | 5.375% | |||||||||||||||||||||||||||||
| Repayments of convertible notes | 2,500,000,000 | 2,500,000,000 | 99,000,000 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Aggregate principal amount of notes issued | 5,000,000,000 | 10,500,000,000 | 2,500,000,000 | 2,500,000,000 | 550,000,000 | 675,000,000 | 475,000,000 | 700,000,000 | 5,000,000,000 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Total debt issuance costs | 25,000,000 | 55,000,000 | 17,000,000 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Redemption price as a percentage of the principal amount of notes that may be required to be paid in the event of a change in control triggering event | 101.00% | 101.00% | 101.00% | 101.00% | 101.00% | 101.00% | 101.00% | 101.00% | 101.00% | 101.00% | 101.00% | 101.00% | 101.00% | 101.00% | 101.00% | 101.00% | 101.00% | 101.00% | 101.00% | 101.00% | 101.00% | 101.00% | 101.00% | 101.00% | 101.00% | 101.00% | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Convertible notes conversion ratio into common stock | 12.8809 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Principal amount of notes to which the common stock conversion ratio is applied | 1,000 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Conversion price per share of convertible notes | $ 77.63 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Ratio of closing price of common stock to respective conversion price per share that needs to be exceeded in previous quarter to allow conversion | 130.00% | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Conversion of convertible notes before maturity period | within one month | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Cash settlement of convertible bond hedge | 99,000,000 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Potential settlements of warrants (In May 2013) (in shares) | 31.5 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Exercise price of warrants | 105.48 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Warrants to acquire shares of our common stock , expired (in shares) | 31.3 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Effective interest rate on convertible notes | 6.24% | 6.24% | 6.35% | 6.35% | 6.35% | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Interest expense, net | 1,053,000,000 | 610,000,000 | 604,000,000 | 13,000,000 | 149,000,000 | 151,000,000 | 143,000,000 | 134,000,000 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Non-cash interest expense | 12,000,000 | 146,000,000 | 142,000,000 | 133,000,000 | 125,000,000 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Total noncurrent debt | 24,034,000,000 | 21,344,000,000 | 1,000,000,000 | 1,000,000,000 | 1,000,000,000 | 1,000,000,000 | 749,000,000 | 748,000,000 | 999,000,000 | 999,000,000 | 1,248,000,000 | 1,099,000,000 | 1,099,000,000 | 499,000,000 | 499,000,000 | 723,000,000 | 714,000,000 | 999,000,000 | 998,000,000 | 887,000,000 | 300,000,000 | 300,000,000 | 897,000,000 | 897,000,000 | 998,000,000 | 998,000,000 | 1,745,000,000 | 1,745,000,000 | 747,000,000 | 763,000,000 | 739,000,000 | 1,117,000,000 | 899,000,000 | 899,000,000 | 499,000,000 | 499,000,000 | 996,000,000 | 996,000,000 | 697,000,000 | 697,000,000 | 595,000,000 | 595,000,000 | 2,232,000,000 | 2,232,000,000 | 1,244,000,000 | 1,244,000,000 | 1,000,000,000 | 100,000,000 | 100,000,000 | 9,000,000 | |||||||||||||||||||||||||||||||
| Other convertible notes, current | 2,488,000,000 | 84,000,000 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Interest rate swap contracts - fair value hedge - notional amounts | 3,600,000,000 | 3,600,000,000 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Derivative lower range variable interest rate | 0.30% | 0.30% | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Derivative higher range variable interest rate | 2.60% | 2.60% | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Maximum borrowing capacity under commercial paper program | 2,500,000,000 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Amount outstanding under commercial paper program | 0 | 0 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Maximum current borrowing capacity under a syndicated, unsecured, revolving credit agreement | 2,500,000,000 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Amount by which the borrowing capacity under a syndicated, unsecured, revolving credit agreement maybe increased upon our request at the discretion of the banks | 500,000,000 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Initial commitment term of each bank which is a party to the agreement | 5 years | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Number of additional extensions | 2 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Additional period for extension of commitment term | 1 year | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Annual commitment fees for syndicated, unsecured, revolving credit agreement | 0.10% | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Interest rate charged over LIBOR on any amounts borrowed under the facility | 0.90% | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Amount outstanding under syndicated, unsecured, revolving credit facility | 0 | 0 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Previous revolving credit facilities, terminated in period | 2,300,000,000 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Amount that may be issued under a medium term note program established under the shelf registration statement | 400,000,000 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Amount outstanding under medium term note program | 0 | 0 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Interest costs capitalized | 26,000,000 | 22,000,000 | 33,000,000 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Interest paid, net of interest rate swaps | 406,000,000 | 446,000,000 | 323,000,000 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Receipt from counterparties upon termination of interest rate swap contracts | $ 397,000,000 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||