Debt Debt Obligation Maturities (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012		Dec. 31, 2011
Debt Maturities [Abstract]
Total Debt excluding capital leases, Fair Value			$ 12,947	[1]
Successor [Member]
Debt Maturities [Abstract]
Debt maturities - 2013	453
Debt maturities - 2014	646
Debt maturities - 2015	365
Debt maturities - 2016	373
Debt maturities - 2017	717
Debt maturities - Thereafter	11,979
Total Debt	14,533	[2]	12,665	[2]
Total Debt excluding capital leases	13,455	[1],[3]
Total Debt excluding capital leases, Fair Value	$ 15,291	[1]
Weighted Average Interest Rate on Debt and Capital Lease Obligations [Abstract]
Weighted Average Interest Rate On Debt And Capital Lease Obligations - 2013	5.10%
Weighted Average Interest Rate On Debt And Capital Lease Obligations - 2014	6.80%
Weighted Average Interest Rate On Debt And Capital Lease Obligations - 2015	5.20%
Weighted Average Interest Rate On Debt And Capital Lease Obligations - 2016	6.60%
Weighted Average Interest Rate On Debt And Capital Lease Obligations - 2017	5.70%
Weighted Average Interest Rate On Debt And Capital Lease Obligations - Thereafter	5.40%
Total Debt, Weighted Average Interest Rate	5.50%

[1] Amount also excludes unamortized gains on interest rate swaps.

[2] Amounts represent debt outstanding and weighted average effective interest rates for 2012 and 2011, respectively. Maturities are as of December 31, 2012.

[3] Amount also excludes unamortized fair value adjustment under acquisition method accounting related to capital leases.