v2.4.0.6

Related Party Transactions Notes Receivable (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Mar. 31, 2013 | Mar. 31, 2012 | Mar. 31, 2013 Plantation Pipe Line Company [Member] | Dec. 31, 2012 Southern LNG Company, L.L.C.(SLNG) [Member] | Mar. 31, 2013 Southern LNG Company, L.L.C.(SLNG) [Member] | May 25, 2012 Southern LNG Company, L.L.C.(SLNG) [Member] | Mar. 31, 2013 Southern LNG Company, L.L.C.(SLNG) [Member] | Mar. 31, 2013 Gulf LNG Holdings Group LLC [Member]
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Ownership interest |  |  | 51.17% |  |  |  | 50.00% |
Notes Receivable, Related Parties |  |  | $ 49 | $ 10 | $ 10 | $ 85 |  |
Proceeds from Related Party Debt | 10 | 0 |  | 75 |  |  |  |
Related party transaction, rate |  |  | 4.25% |  |  |  |  |
Notes receivable, balloon payment, related parties |  |  | 45 |  |  |  |  |
Notes receivable, related parties, current |  |  | $ 1 |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  |  | 12.00%

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