Other Assets (Details) (USD $) In Millions, unless otherwise specified	1 Months Ended
	Jul. 31, 2010 Variable Interest Entity, Not Primary Beneficiary	Jul. 31, 2010 Variable Interest Entity, Primary Beneficiary	Dec. 31, 2012 Successor [Member]	Dec. 31, 2012 Successor [Member] Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Company limited partner holding interest, percentage	99.90%	0.10%
Unconsolidated Partnership, assets			$ 480
Unamortized investment balance classified as Other Assets				437
Remaining commitments classified as Other Liabilities				18
Maximum exposure to loss				437
Remaining commitments due at the end of 2013				$ 18