Debt (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2016	Dec. 31, 2013	Dec. 31, 2012	Sep. 01, 2011	Jun. 30, 2011	Jun. 16, 2011
Summary of long-term debt, including the current portion
Total long-term debt	$ 3,687	$ 3,386
Less current portion of long-term debt	(321)	(4)
Long-term debt less current portion	3,366	3,382
$300 floating rate senior unsecured notes due June 16, 2014									300
Debt instrument basis spread on variable rate									0.33%
Short-term debt	86	72
Percentage of principal company must offer to purchase all or part of the note if certain change of control events occur									101.00%
Long-term line of credit								500
Revolving credit due to expire				500	500	500	500
Line of credit facility, maximum borrowing capacity	1,500
Current portion of long-term debt	(321)	(4)
Borrowings outstanding under revolving credit facilities	0	0
Short-term Debt [Abstract]
US short term commerical paper	75	50
Short-term debt	86	72
Short-term debt, weighted average interest rate	0.45%	0.45%
US other short-term debt	10	15
Non-US short-term debt	1	7
Non-US short-term line of credit available	1,181
Maturities of Long-term Debt [Abstract]
2012	321
2013	310
2014	570
2015	103
2016	1
Interest Expense [Abstract]
Interest paid on debt	174	170	180
7.58% notes due 2012 [Member]
Summary of long-term debt, including the current portion
Total long-term debt	12	12
Interest rate	7.58%
5.75% notes due 2012 [Member]
Summary of long-term debt, including the current portion
Total long-term debt	300	300
Interest rate	5.75%
4.9% notes due 2013 [Member]
Summary of long-term debt, including the current portion
Total long-term debt	300	300
Related long-term debt converted to floating interest rates by interest rate swaps	200
Interest rate	4.90%
5.95% notes due 2014 [Member]
Summary of long-term debt, including the current portion
Total long-term debt	250	250
Related long-term debt converted to floating interest rates by interest rate swaps	100
Interest rate	5.95%
Floating rate notes due 2014 [Member]
Summary of long-term debt, including the current portion
Total long-term debt	300
Related long-term debt converted to fixed interest rate by interest rate swap	300
4.65% notes due 2015 [Member]
Summary of long-term debt, including the current portion
Total long-term debt	100	100
Interest rate	4.65%
5.3% notes due 2017 [Member]
Summary of long-term debt, including the current portion
Total long-term debt	250	250
Interest rate	5.30%
6.875% to 7.09% notes due 2018 [Member]
Summary of long-term debt, including the current portion
Total long-term debt	36	36
Minimum interest rate	6.875%
Maximum interest rate	7.09%
5.6% notes due 2018 [Member]
Summary of long-term debt, including the current portion
Total long-term debt	450	450
Related long-term debt converted to floating interest rates by interest rate swaps	215
Interest rate	5.60%
4.215% Japanese Yen notes due 2018 [Member]
Summary of long-term debt, including the current portion
Total long-term debt	129	123
Interest rate	4.215%
6.95% notes due 2019 [Member]
Summary of long-term debt, including the current portion
Total long-term debt	300	300
Related long-term debt converted to floating interest rates by interest rate swaps	300
Interest rate	6.95%
8-7/8% debentures due 2019 [Member]
Summary of long-term debt, including the current portion
Total long-term debt	38	38
Related long-term debt converted to floating interest rates by interest rate swaps	25
Interest rate	8.875%
8.10% debentures due 2022 [Member]
Summary of long-term debt, including the current portion
Total long-term debt	100	100
Interest rate	8.10%
7.625% debentures due 2024 [Member]
Summary of long-term debt, including the current portion
Total long-term debt	66	66
Related long-term debt converted to floating interest rates by interest rate swaps	25
Interest rate	7.625%
6-1/2% debentures due 2025 [Member]
Summary of long-term debt, including the current portion
Total long-term debt	145	145
Interest rate	6.50%
7.875% debentures due 2026 [Member]
Summary of long-term debt, including the current portion
Total long-term debt	72	72
Interest rate	7.875%
7.65% debentures due 2029 [Member]
Summary of long-term debt, including the current portion
Total long-term debt	200	200
Related long-term debt converted to floating interest rates by interest rate swaps	50
Interest rate	7.65%
5.45% debentures due 2034 [Member]
Summary of long-term debt, including the current portion
Total long-term debt	140	140
Related long-term debt converted to floating interest rates by interest rate swaps	25
Interest rate	5.45%
5.25% notes due 2035 [Member]
Summary of long-term debt, including the current portion
Total long-term debt	27	42
Interest rate	5.25%
5.8% notes due 2037 [Member]
Summary of long-term debt, including the current portion
Total long-term debt	240	240
Interest rate	5.80%
Other long-term debt [Member]
Summary of long-term debt, including the current portion
Total long-term debt	$ 232	$ 222