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Derivative Activities - Derivative Assets (Details) (Successor [Member], Designated as Hedging Instrument [Member], USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Derivatives, Fair Value [Line Items]
Derivatives, gross	$ 0	$ 24
Fuel Contracts \| Other Current Assets
Derivatives, Fair Value [Line Items]
Derivatives, gross	$ 0	$ 24

Fair value of derivative asset, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position.

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