|
Financing arrangements (Details) (USD $)
In Millions, unless otherwise specified
|
Mar. 31, 2013
|
Dec. 31, 2012
|
| Carrying values of long-term borrowings |
|
|
| Other notes |
$ 112 |
$ 109 |
| Total debt |
23,892 |
26,529 |
| Less current portion |
(7) |
(2,495) |
| Total noncurrent debt |
23,885 |
24,034 |
|
0.375% convertible notes due 2013 (0.375% 2013 Convertible Notes) [Member]
|
|
|
| Debt Instruments [Line Items] |
|
|
| Interest rate, stated percentage |
0.375% |
0.375% |
| Carrying values of long-term borrowings |
|
|
| Convertible notes, current |
0 |
2,488 |
|
1.875% notes due 2014 (1.875% 2014 Notes) [Member]
|
|
|
| Debt Instruments [Line Items] |
|
|
| Interest rate, stated percentage |
1.875% |
1.875% |
| Carrying values of long-term borrowings |
|
|
| Total noncurrent debt |
1,000 |
1,000 |
|
4.85% notes due 2014 (4.85% 2014 Notes) [Member]
|
|
|
| Debt Instruments [Line Items] |
|
|
| Interest rate, stated percentage |
4.85% |
4.85% |
| Carrying values of long-term borrowings |
|
|
| Total noncurrent debt |
1,000 |
1,000 |
|
2.30% notes due 2016 (2.30% 2016 Notes) [Member]
|
|
|
| Debt Instruments [Line Items] |
|
|
| Interest rate, stated percentage |
2.30% |
2.30% |
| Carrying values of long-term borrowings |
|
|
| Total noncurrent debt |
749 |
749 |
|
2.50% notes due 2016 (2.50% 2016 Notes) [Member]
|
|
|
| Debt Instruments [Line Items] |
|
|
| Interest rate, stated percentage |
2.50% |
2.50% |
| Carrying values of long-term borrowings |
|
|
| Total noncurrent debt |
999 |
999 |
|
2.125% notes due 2017 (2.125% 2017 Notes) [Member]
|
|
|
| Debt Instruments [Line Items] |
|
|
| Interest rate, stated percentage |
2.125% |
2.125% |
| Carrying values of long-term borrowings |
|
|
| Total noncurrent debt |
1,248 |
1,248 |
|
5.85% notes due 2017 (5.85% 2017 Notes) [Member]
|
|
|
| Debt Instruments [Line Items] |
|
|
| Interest rate, stated percentage |
5.85% |
5.85% |
| Carrying values of long-term borrowings |
|
|
| Total noncurrent debt |
1,099 |
1,099 |
|
6.15% notes due 2018 (6.15% 2018 Notes) [Member]
|
|
|
| Debt Instruments [Line Items] |
|
|
| Interest rate, stated percentage |
6.15% |
6.15% |
| Carrying values of long-term borrowings |
|
|
| Total noncurrent debt |
499 |
499 |
|
4.375% euro denominated notes due 2018 (4.375% 2018 euro Notes) [Member]
|
|
|
| Debt Instruments [Line Items] |
|
|
| Interest rate, stated percentage |
4.375% |
4.375% |
| Carrying values of long-term borrowings |
|
|
| Total noncurrent debt |
708 |
723 |
|
5.70% notes due 2019 (5.70% 2019 Notes) [Member]
|
|
|
| Debt Instruments [Line Items] |
|
|
| Interest rate, stated percentage |
5.70% |
5.70% |
| Carrying values of long-term borrowings |
|
|
| Total noncurrent debt |
999 |
999 |
|
2.125% euro denominated notes due 2019 (2.125% 2019 euro Notes) [Member]
|
|
|
| Debt Instruments [Line Items] |
|
|
| Interest rate, stated percentage |
2.125% |
2.125% |
| Carrying values of long-term borrowings |
|
|
| Total noncurrent debt |
868 |
887 |
|
4.50% notes due 2020 (4.50% 2020 Notes) [Member]
|
|
|
| Debt Instruments [Line Items] |
|
|
| Interest rate, stated percentage |
4.50% |
4.50% |
| Carrying values of long-term borrowings |
|
|
| Total noncurrent debt |
300 |
300 |
|
3.45% notes due 2020 (3.45% 2020 Notes) [Member]
|
|
|
| Debt Instruments [Line Items] |
|
|
| Interest rate, stated percentage |
3.45% |
3.45% |
| Carrying values of long-term borrowings |
|
|
| Total noncurrent debt |
897 |
897 |
|
4.10% notes due 2021 (4.10% 2021 Notes) [Member]
|
|
|
| Debt Instruments [Line Items] |
|
|
| Interest rate, stated percentage |
4.10% |
4.10% |
| Carrying values of long-term borrowings |
|
|
| Total noncurrent debt |
998 |
998 |
|
3.875% notes due 2021 (3.875% 2021 Notes) [Member]
|
|
|
| Debt Instruments [Line Items] |
|
|
| Interest rate, stated percentage |
3.875% |
3.875% |
| Carrying values of long-term borrowings |
|
|
| Total noncurrent debt |
1,745 |
1,745 |
|
3.625% notes due 2022 (3.625% 2022 Notes) [Member]
|
|
|
| Debt Instruments [Line Items] |
|
|
| Interest rate, stated percentage |
3.625% |
3.625% |
| Carrying values of long-term borrowings |
|
|
| Total noncurrent debt |
747 |
747 |
|
5.50% pound sterling denominated notes due 2026 (5.50% 2026 pound sterling Notes) [Member]
|
|
|
| Debt Instruments [Line Items] |
|
|
| Interest rate, stated percentage |
5.50% |
5.50% |
| Carrying values of long-term borrowings |
|
|
| Total noncurrent debt |
715 |
763 |
|
4.00% pound sterling denominated notes due 2029 (4.00% 2029 pound sterling Notes) [Member]
|
|
|
| Debt Instruments [Line Items] |
|
|
| Interest rate, stated percentage |
4.00% |
4.00% |
| Carrying values of long-term borrowings |
|
|
| Total noncurrent debt |
1,047 |
1,117 |
|
6.375% notes due 2037 (6.375% 2037 Notes) [Member]
|
|
|
| Debt Instruments [Line Items] |
|
|
| Interest rate, stated percentage |
6.375% |
6.375% |
| Carrying values of long-term borrowings |
|
|
| Total noncurrent debt |
899 |
899 |
|
6.90% notes due 2038 (6.90% 2038 Notes) [Member]
|
|
|
| Debt Instruments [Line Items] |
|
|
| Interest rate, stated percentage |
6.90% |
6.90% |
| Carrying values of long-term borrowings |
|
|
| Total noncurrent debt |
499 |
499 |
|
6.40% notes due 2039 (6.40% 2039 Notes) [Member]
|
|
|
| Debt Instruments [Line Items] |
|
|
| Interest rate, stated percentage |
6.40% |
6.40% |
| Carrying values of long-term borrowings |
|
|
| Total noncurrent debt |
996 |
996 |
|
5.75% notes due 2040 (5.75% 2040 Notes) [Member]
|
|
|
| Debt Instruments [Line Items] |
|
|
| Interest rate, stated percentage |
5.75% |
5.75% |
| Carrying values of long-term borrowings |
|
|
| Total noncurrent debt |
697 |
697 |
|
4.95% notes due 2041 (4.95% 2041 Notes) [Member]
|
|
|
| Debt Instruments [Line Items] |
|
|
| Interest rate, stated percentage |
4.95% |
4.95% |
| Carrying values of long-term borrowings |
|
|
| Total noncurrent debt |
595 |
595 |
|
5.15% notes due 2041 (5.15% 2041 Notes) [Member]
|
|
|
| Debt Instruments [Line Items] |
|
|
| Interest rate, stated percentage |
5.15% |
5.15% |
| Carrying values of long-term borrowings |
|
|
| Total noncurrent debt |
2,232 |
2,232 |
|
5.65% notes due 2042 (5.65% 2042 Notes) [Member]
|
|
|
| Debt Instruments [Line Items] |
|
|
| Interest rate, stated percentage |
5.65% |
5.65% |
| Carrying values of long-term borrowings |
|
|
| Total noncurrent debt |
1,244 |
1,244 |
|
5.375% notes due 2043 (5.375% 2043 Notes) [Member]
|
|
|
| Debt Instruments [Line Items] |
|
|
| Interest rate, stated percentage |
5.375% |
5.375% |
| Carrying values of long-term borrowings |
|
|
| Total noncurrent debt |
$ 1,000 |
$ 1,000 |