Financial Instruments (Estimated Fair Value of Debt, Financing and Capital Lease Obligations) (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Dec. 31, 2012
Successor [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial Instruments, Owned, Corporate Debt, at Fair Value	$ 0	$ 2,929
Derivative Asset	0	175
Current and long-term debt, financing and capital lease obligations, Carrying amount	33,001
Liabilities, Fair Value Disclosure, Nonrecurring	32,912
Successor [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial Instruments, Owned, Corporate Debt, at Fair Value		0
Derivative Asset		0
Liabilities, Fair Value Disclosure, Nonrecurring	25,900
Successor [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial Instruments, Owned, Corporate Debt, at Fair Value		0
Derivative Asset		0
Liabilities, Fair Value Disclosure, Nonrecurring	5,797
Successor [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial Instruments, Owned, Corporate Debt, at Fair Value		2,929
Derivative Asset		175
Liabilities, Fair Value Disclosure, Nonrecurring	1,215
Predecessor [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial Instruments, Owned, Corporate Debt, at Fair Value		0
Derivative Asset		0
Current and long-term debt, financing and capital lease obligations, Carrying amount		23,569
Liabilities, Fair Value Disclosure, Nonrecurring		26,728
Predecessor [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liabilities, Fair Value Disclosure, Nonrecurring		17,506
Predecessor [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liabilities, Fair Value Disclosure, Nonrecurring		6,118
Predecessor [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liabilities, Fair Value Disclosure, Nonrecurring		3,104
Investments [Member] | Successor [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value	0	2,929
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales	(3,100)
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Accretion Of Impairment Included In Earnings	12
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Change In Fair Value	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net	0
Derivative Financial Instruments, Assets [Member] | Successor [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value	0	175
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales	0
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Accretion Of Impairment Included In Earnings	0
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Change In Fair Value	(175)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net	$ 0