Employment Benefit Plans Change in Plan Assets (Details) (Successor [Member], USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011
Defined Benefit Plan, Amounts Recognized in Balance Sheet [Abstract]
Pension and Other Postretirement Defined Benefit Plans, Current Liabilities	$ 31		$ 31
Pension and Other Postretirement Defined Benefit Plans, Liabilities	817		800
Pension Plans, Defined Benefit [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Beginning balance	1,817		1,828
Actual return on plan assets	302		86
Employer contributions	53	[1]	58	[1]
Benefits paid	(141)		(139)
Administration expenses	(1)		0
Settlements	(16)		(16)
Ending balance	2,014		1,817
Funded status (plan assets less projected benefit obligations)	(503)		(507)
Other Postretirement Benefit Plans, Defined Benefit [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Beginning balance	0		0
Employer contributions	21	[2]	22	[2]
Plan participants' contributions	5		6
Benefits paid	(26)		(28)
Ending balance	0		0
Funded status (plan assets less projected benefit obligations)	$ (314)		$ (293)

[1] Other than contributions to the qualified pension plan, employer contributions were classified as Other, Net under Operating Activities in the Company’s Consolidated Statements of Cash Flows.

[2] Employer contributions were classified as Other, Net under Operating Activities in the Company’s Consolidated Statements of Cash Flows.