Taxes on Income - Current and Deferred (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended	12 Months Ended	3 Months Ended	12 Months Ended
Dec. 31, 2012 Successor	Dec. 31, 2013 Successor	Mar. 25, 2012 Predecessor	Dec. 31, 2011 Predecessor
Income Tax Disclosure
Federal	$ (8)	$ 58	$ 5	$ 24
State	(2)	9	1	(5)
Current Income Tax Expense (Benefit)	(10)	67	6	19
Federal	72	44	17	67
State	14	7	2	9
Deferred income taxes	86	51	19	76
Total income tax expense	$ 76	$ 118	$ 25	$ 95

Amount of current federal tax expense (benefit) pertaining to income (loss) from continuing operations.

Amount of current income tax expense (benefit) pertaining to taxable income (loss) from continuing operations.

Amount of current state and local tax expense (benefit) pertaining to income (loss) from continuing operations.

Amount of deferred federal income tax expense (benefit) pertaining to income (loss) from continuing operations.

Amount of deferred income tax expense (benefit) pertaining to income (loss) from continuing operations.

Amount of deferred state and local tax expense (benefit) pertaining to income (loss) from continuing operations.