Asset Retirement Obligations - Summary of Changes in AROs (Detail) (USD $) In Millions, unless otherwise specified			6 Months Ended	12 Months Ended			11 Months Ended	12 Months Ended	1 Months Ended
Jun. 30, 2013	Dec. 31, 2012	Jun. 30, 2013 Asset Retirement Obligation [Member]	Dec. 31, 2012 Asset Retirement Obligation [Member]	Dec. 31, 2012 Successor [Member]	Dec. 31, 2011 Successor [Member]	Dec. 31, 2011 Successor [Member] Asset Retirement Obligation [Member]	Dec. 31, 2012 Successor [Member] Asset Retirement Obligation [Member]	Jan. 31, 2011 Predecessor [Member] Asset Retirement Obligation [Member]
Asset Retirement Obligations [Line Items]
Beginning balance	$ 103	$ 113	$ 113	$ 30			$ 29	$ 30	$ 19
Additions			2	7				7
Accretion expense			2	5			2	5
Changes in estimates, including cost and timing of cash flows			(14)	11			1	9
Settlements/payments				(1)			(2)	(1)
AROs acquired in the acquisition of mineral sands business				61				58
Fresh-start adjustments									10
Ending balance	103	113	103	113			30	108	29
Current portion included in accrued liabilities	180	209	7	7	209	46	1	2	1
Noncurrent portion			$ 96	$ 106			$ 29	$ 106	$ 28

Asset retirement obligation acquired in acquisition.

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Fresh Start Adjustment

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Carrying value as of the balance sheet date of obligations incurred and payable, pertaining to costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered. Examples include taxes, interest, rent and utilities. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

+ References

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The carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees.

+ References

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Amount of accretion expense recognized during the period that is associated with an asset retirement obligation. Accretion expense measures and incorporates changes due to the passage of time into the carrying amount of the liability.

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Amount of asset retirement obligations incurred during the period.

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Amount of asset retirement obligations settled, or otherwise disposed of, during the period. This may include asset retirement obligations transferred to third parties associated with the sale of a long-lived asset.

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Amount of the Increase or Decrease in the amount of the asset retirement obligation during the current period for changes in the amount or timing of the estimated cash flows associated with the settlement of the obligation.

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The noncurrent portion (due beyond one year or one operating cycle) of other accrued expenses (expenses incurred at the end of the reporting period but not yet paid) not otherwise defined in the taxonomy.

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