Employment Benefit Plans Change in AOCL (Details) (USD $) In Millions, unless otherwise specified	11 Months Ended		12 Months Ended			11 Months Ended		12 Months Ended			1 Months Ended
	Dec. 31, 2010 Successor [Member] Pension Plans, Defined Benefit [Member]		Dec. 31, 2013 Successor [Member] Pension Plans, Defined Benefit [Member]	Dec. 31, 2012 Successor [Member] Pension Plans, Defined Benefit [Member]	Dec. 31, 2011 Successor [Member] Pension Plans, Defined Benefit [Member]	Dec. 31, 2010 Successor [Member] Other Postretirement Benefit Plans, Defined Benefit [Member]		Dec. 31, 2013 Successor [Member] Other Postretirement Benefit Plans, Defined Benefit [Member]	Dec. 31, 2012 Successor [Member] Other Postretirement Benefit Plans, Defined Benefit [Member]	Dec. 31, 2011 Successor [Member] Other Postretirement Benefit Plans, Defined Benefit [Member]	Feb. 12, 2010 Predecessor [Member] Pension Plans, Defined Benefit [Member]	Feb. 12, 2010 Predecessor [Member] Other Postretirement Benefit Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Amortization of Net Gains (Losses)			$ 10					$ 3
Defined Benefit Plan, Change in Accumulated Other Comprehensive Income Loss [Roll Forward]
Beginning balance	0	[1]	330	311	2	0	[1]	60	35	19	792	19
Amortization of actuarial loss	0			(10)	0	0			(1)	0	(3)	0
Actuarial loss (gain)	2			29	310	19			31	16	0	0
Plan amendment						0			(5)	0		0
Settlements	0			0	(1)						0
Ending balance	2			330	311	19			60	35	789	19
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), before Tax [Abstract]
Net actuarial loss				341	312				66	35
Plan Amendment				0	0				(5)	0
Amortization of actuarial loss	0			(10)	0	0			(1)	0	(3)	0
Settlements				(1)	(1)				0	0
Pre-tax amount recognized in AOCL at December 31,	2			330	311	19			60	35	789	19
Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), after Tax [Abstract]
After-tax amount recognized in AOCL at December 31,				$ 204	$ 192				$ 37	$ 21

[1] Upon application of acquisition method accounting due to the Merger, the Company eliminated the beginning balance in AOCL.