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Commitments and Contingencies (Commitments) (Details) (USD $) In Millions, unless otherwise specified | Jun. 30, 2012 Inventories | Jul. 31, 2012 Inventories Operating Leases, Purchase Power Contracts Subsequent Event | Jun. 30, 2012 Environmental Indemnities
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Commitments and Guarantees |  |  |
Estimated additional commitments, 2014 |  | $ 51 |
Estimated additional commitments, 2015 | 21 | 53 |
Estimated additional commitments, 2016 | 45 | 50 |
Estimated additional commitments, thereafter | 944 | 199 |
Maximum liability under indemnity per Mountainview purchase agreement for damages and other amounts |  |  | $ 60

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