Fair Value Measurements (Detail 4) (USD $) In Millions	Dec. 31, 2010	Dec. 31, 2009
Carrying Amounts and Estimated Fair Values of Financial Instruments
Long-term debt (excluding current portion)	$ 4,183	$ 5,097
Long-term debt, excluding current portion - fair value	$ 4,466	$ 5,355

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.

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

Name:	us-gaap_LongTermDebtNoncurrent
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant