Commitments and Contingencies - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended			3 Months Ended	12 Months Ended		10 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Mar. 10, 2012 Lawsuits	Sep. 30, 2011 Successor [Member]	Sep. 30, 2013 Successor [Member]	Sep. 30, 2012 Successor [Member]	Jul. 19, 2011 Predecessor [Member]
Contingencies And Commitments [Line Items]
Net lease and rental expense				$ 12	$ 61	$ 63	$ 45
Talent advances long-term commitments payable	10 years
Current firm commitments	201	232
Off-balance sheet commitments to investees	$ 7	$ 4
Number of putative class action lawsuits			5