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Commitments and Contingencies Loans and Debentures (Details) (USD $)
In Millions, unless otherwise specified |
6 Months Ended | ||||
|---|---|---|---|---|---|
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Mar. 31, 2013
Total Loans and Debentures [Member]
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Sep. 30, 2012
Total Loans and Debentures [Member]
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Mar. 31, 2013
Loans [Member]
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Mar. 31, 2013
DoT loan [Member]
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Mar. 31, 2013
Debentures [Member]
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| Short-term Debt [Line Items] | |||||
| Payment made to India's Department of Telecommunications (DoT) in March 2012 | $ 81 | ||||
| Carrying value and approximate fair value | $ 1,100 | $ 1,100 | $ 455 | $ 76 | $ 530 |
| Maturity date | May 31, 2014 | Dec. 01, 2014 | Jun. 25, 2017 | ||
| Spread on variable interest rate | 0.25% | 0.25% | |||
| Interest rate at end of period | 9.75% | 9.75% | 10.25% | ||
| Earliest date to demand redemption | Jun. 25, 2013 | ||||
| X | ||||||||||
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- Definition
Earliest date before maturity when the holder can put the outstanding debt instrument for repayment or conversion to equity, in CCYY-MM-DD format. No definition available.
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| X | ||||||||||
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- Definition
Payment of the amount of unpaid dues claimed by the Indian government to be owed by one of the Company's susdiaries' Indian shareholders. No definition available.
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| X | ||||||||||
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- Definition
The percentage points added to the reference rate to compute the variable rate on the debt instrument. No definition available.
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| X | ||||||||||
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- Definition
The effective interest rate at the end of the reporting period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Details
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