Debt Variable Interest Entities - Leases (Details) (Successor [Member], USD $) In Millions, unless otherwise specified	Dec. 31, 2012
Operating Leased Assets [Line Items]
Future minimum lease payments	$ 5,119	[1]
Variable Interest Entity, Not Primary Beneficiary | Reporting Entity | Equipment
Operating Leased Assets [Line Items]
Future minimum lease payments	$ 4,000

[1] Excludes leases having non-cancelable lease terms of less than one year and per diem leases.