CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $) In Millions, except Share data, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Common stock, shares outstanding	51,154,280
Class A common stock [Member]
Common stock, shares issued	12,626,400
Successor [Member]
Net of allowance for doubtful accounts receivable	$ 3	$ 1
Common stock, par value		$ 0.01
Common stock, shares authorized		100,000,000
Common stock, shares issued		77,034,015
Common stock, shares outstanding	62,103,989	75,383,455
Treasury stock, shares issued		472,565
Successor [Member] | Class A common stock [Member]
Common stock, par value	$ 0.01
Common stock, shares issued	63,413,288
Common stock, shares outstanding	62,103,989
Successor [Member] | Class B common stock [Member]
Common stock, par value	$ 0.01
Common stock, shares issued	51,154,280
Common stock, shares outstanding	51,154,280