Assets and Liabilities Measured at Fair Value (Details) (USD $)
In Millions, unless otherwise specified |
Mar. 31, 2013
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Dec. 31, 2012
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Dec. 31, 2011
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Current assets: | |||
Interest rate swap arrangements (note 9) | $ 1 | $ 2 | |
Current liabilities: | |||
Interest rate swap arrangements (note 9) | 13 | 61 | |
Recurring
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Current assets: | |||
Cash equivalents | 314 | 424 | 493 |
Interest rate swap arrangements (note 9) | 1 | 2 | |
Current liabilities: | |||
Interest rate swap arrangements (note 9) | 13 | 61 | |
Long-term liabilities | |||
Debt (note 6) | 3,703 | 3,626 | 2,636 |
Recurring | Level 1
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Current assets: | |||
Cash equivalents | 314 | 424 | 493 |
Recurring | Level 2
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Current assets: | |||
Interest rate swap arrangements (note 9) | 1 | 2 | |
Current liabilities: | |||
Interest rate swap arrangements (note 9) | 13 | 61 | |
Long-term liabilities | |||
Debt (note 6) | $ 3,703 | $ 3,626 | $ 2,636 |
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- Definition
This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the Company may deposit additional funds at any time and also effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Fair value as of the balance sheet date of interest rate derivative assets, which includes all such derivative instruments in hedging and nonhedging relationships that are recognized as assets. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Fair value as of the balance sheet date of interest rate derivative liabilities, which includes all such derivative instruments in hedging and nonhedging relationships that are recognized as liabilities. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. No definition available.
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