Employment Benefit Plans Assumptions Used (Details) (USD $) In Millions, unless otherwise specified	1 Months Ended			12 Months Ended	11 Months Ended		12 Months Ended				11 Months Ended	12 Months Ended
	Feb. 12, 2010 Predecessor [Member] Other Postretirement Benefit Plans, Defined Benefit [Member]		Feb. 12, 2010 Predecessor [Member] Pension Plans, Defined Benefit [Member]	Dec. 31, 2013 Successor [Member]	Dec. 31, 2010 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]		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]
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Discount Rate - expense	5.75%		5.75%	3.75%	5.75%		4.50%		5.25%		5.75%		4.50%	5.25%
Expected Long-term Return on Assets - expense			8.00%								8.00%	6.75%	6.75%	7.50%
Rate of Compensation Increase - expense	3.80%		3.80%		3.80%		3.80%		3.80%		3.80%		3.80%	3.80%
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]
Discount Rate - benefit obligations							3.75%		4.50%				3.75%	4.50%
Rate of Compensation Increase - benefit obligations							3.80%		3.80%				3.80%	3.80%
Assumptions Sensitivity Analysis [Abstract]
Effect of 50 basis point decrease in discount rate							$ 1						$ 11
Effect of 50 basis point increase in discount rate							1						9
Effect of 50 basis point decrease in rate of return on plan assets													9
Effect of 50 basis point increase in rate of return on plan assets													9
Defined Benefit Plan, Assumed Health Care Cost Trend Rates [Abstract]
Assumed health care cost trend rate for next year (participants under 65)	9.00%				9.00%		8.40%		8.70%
Assumed health care cost trend rate for next year (participants over 65)	9.00%	[1]			9.00%	[1]	3.00%	[1]	8.70%	[1]
Defined Benefit Plan, Ultimate Health Care Cost Trend Rate	5.00%	[2]			4.80%	[2]	4.50%	[2]	4.50%	[2]
Defined Benefit Plan, Year that Rate Reaches Ultimate Trend Rate	2016	[2]			2022	[2]	2028	[2]	2028	[2]
Defined Benefit Plan, Effect of One Percentage Point Increase on Service and Interest Cost Components							1
Defined Benefit Plan, Effect of One Percentage Point Decrease on Service and Interest Cost Components							(1)
Defined Benefit Plan, Effect of One Percentage Point Increase on Accumulated Postretirement Benefit Obligation							24
Defined Benefit Plan, Effect of One Percentage Point Decrease on Accumulated Postretirement Benefit Obligation							$ (20)

[1] See section heading "Plan Amendment" for a description of changes to this program.

[2] For the year ended December 31, 2012, the ultimate trend rate only applies to participants under 65.