Stock-Based Compensation Plans (Summary Of Values Related To Vested And Unvested Restricted Stock Awards) (Detail) (USD $) In Millions, except Per Share data, unless otherwise specified	6 Months Ended	12 Months Ended	6 Months Ended	12 Months Ended	6 Months Ended
Dec. 31, 2011 Restricted Stock [Member]	Dec. 31, 2013 Restricted Stock [Member]	Dec. 31, 2012 Restricted Stock [Member]	Jun. 30, 2011 Restricted Stock [Member] Predecessor [Member]	Dec. 31, 2011 Restricted Stock Units [Member]	Dec. 31, 2013 Restricted Stock Units [Member]	Dec. 31, 2012 Restricted Stock Units [Member]	Jun. 30, 2011 Restricted Stock Units [Member] Predecessor [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Intrinsic Value of Awards Vesting During the Period	$ 1	$ 20	$ 5	$ 3	$ 0	$ 0	$ 0	$ 0
Weighted Average Grant Date Fair Value of Awards Granted During the Period (in USD per share)	$ 41.54	$ 87.06	$ 43.11	$ 48.53	$ 33.78	$ 73.48	$ 44.38	$ 45.22

The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(2)(iii)(1)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration