Income Taxes - Components of Deferred Tax Assets and Liabilities (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
State net operating losses	$ 294	$ 253
Foreign net operating losses	23	24
Federal net operating loss	1,466	1,281
Compensation programs	145	142
Allowance for doubtful accounts	89	77
Self-insurance reserves	16	17
Accrued expenses	52	45
Federal tax credits	52	35
Federal indirect tax benefits of uncertain state tax positions	1	27
Investment in CGP LLC	0	23
Investments in non-consolidated affiliates	28	39
Capital loss carryover	134	136
Deferred revenue	93us-gaap_DeferredTaxAssetsDeferredIncome	41us-gaap_DeferredTaxAssetsDeferredIncome
Other	0us-gaap_DeferredTaxAssetsOther	10us-gaap_DeferredTaxAssetsOther
Subtotal	2,393us-gaap_DeferredTaxAssetsGross	2,150us-gaap_DeferredTaxAssetsGross
Less: valuation allowance	970	740
Total deferred tax assets	1,423us-gaap_DeferredTaxAssetsNet	1,410us-gaap_DeferredTaxAssetsNet
Depreciation and other property-related items	1,143	1,189
Deferred cancellation of debt income and other debt-related items	1,508	1,834
Investment in CGP LLC	21	0
Intangibles	998	1,118
Prepaid expenses	28	25
Other	2us-gaap_DeferredTaxLiabilitiesOther	0us-gaap_DeferredTaxLiabilitiesOther
Total deferred tax liabilities	3,700us-gaap_DeferredIncomeTaxLiabilities	4,166us-gaap_DeferredIncomeTaxLiabilities
Net deferred tax liability	$ 2,277us-gaap_DeferredTaxLiabilities	$ 2,756us-gaap_DeferredTaxLiabilities

Deferred Tax Assets, Federal Indirect Tax Benefits of Uncertain State Tax Positions

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Amount of deferred tax liability attributable to taxable temporary differences.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible domestic operating loss carryforwards. Excludes state and local operating loss carryforwards.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from the allowance for doubtful accounts.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from estimated losses under self insurance.

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Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

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Amount of deferred tax liability attributable to taxable temporary differences from intangible assets other than goodwill.

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Amount of deferred tax liability attributable to taxable temporary differences from investments (excludes investments in subsidiaries and equity method investments).

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Amount of deferred tax consequences attributable to taxable temporary differences derived from prepaid expenses.

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Amount of deferred tax liability attributable to taxable temporary differences from property, plant, and equipment.

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