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Debt (Details 4) (USD $) In Millions, unless otherwise specified | 12 Months Ended |
--- | --- | ---
Dec. 31, 2012 | Dec. 31, 2011
Debt |  |
Weighted-average life of long-term debt | 12 years |
Maturities |  |
2015 | $ 550 |
2016 | 480 |
2017 | 400 |
Thereafter | 4,900 |
Total | 6,330 |
Aggregate unamortized net discount | 15 | 13
Other long-term obligations excluded from debt maturities | 5 |
Debt Covenant Compliance | As of December 31, 2012, we were in compliance with the covenants contained in our credit agreements and indentures. |
Issuance period for standby letters of credit, upper limit | seventy days |
Outstanding letters of credit | $ 24 | $ 33

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