Income Taxes Income Taxes - Deferred Tax Assets and Liabilities Table (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Deferred Tax Liabilities, Other Finite-Lived Assets	$ (2,631)	$ (1,999)
Deferred Tax Liabilities, Property, Plant and Equipment	(371)	(436)
Deferred Tax Liabilities, Deferred Expense, Other Capitalized Costs	(1,216)	(1,432)
Deferred Tax Liabilities, Deferred Expense, Deferred Financing Costs	(439)	(416)
Deferred Tax Liabilities, Gross	(4,657)	(4,283)
Deferred Tax Assets, Operating Loss Carryforwards	535	711
Deferred Tax Assets, Derivative Instruments	108	172
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Asset Retirement Obligations	153	142
Deferred Tax Assets, Investment in Subsidiaries	130	106
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-based Compensation Cost	66	47
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Accrued Liabilities	120	90
Deferred Tax Assets, Noncontrolling Interests	152	178
Deferred Tax Assets, Tax Credit Carryforwards, Alternative Minimum Tax	317	225
Deferred Tax Assets, Other	40	55
Deferred Tax Assets, Gross	1,621	1,726
Deferred Tax Assets, Valuation Allowance	(148)	(160)
Deferred Tax Assets, Net of Valuation Allowance	1,473	1,566
Deferred Tax Assets, Net	(3,184)	(2,717)
Deferred income tax asset	223	90
Deferred Tax Liabilities, Net, Noncurrent	(3,407)	(2,807)
Deferred Tax Liabilities, Net	$ (3,184)	$ (2,717)