Income Taxes (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Tax Contingency [Line Items]
Unrecognized Tax Benefits	$ 57	$ 52	$ 41
Unrecognized Tax Benefits, Increases Resulting from Current Period Tax Positions	7	17
Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions	0	0
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities	(2)	0
Unrecognized Tax Benefits, Reductions Resulting from Lapse of Applicable Statute of Limitations	0	(6)
Percent threshold for recognition of tax assets	50.00%
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals	1	2
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate	35.00%	35.00%	35.00%
Partnership earnings not subject to tax	(35.00%)	(35.00%)	(35.00%)
Corporate subsidiary earnings subject to tax	0.20%	0.30%	(0.80%)
Income tax expense attributable to corporate equity earnings	0.60%	0.90%	1.50%
Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Percent	0.80%	0.10%	2.10%
Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential	2.40%	0.00%	0.00%
Effective Income Tax Rate Reconciliation, State and Local Income Taxes	0.70%	0.50%	1.20%
Current Federal Tax Expense (Benefit)	100	31	13
Income (Loss) from Continuing Operations before Income Taxes, Domestic	3,147	2,076	1,033
Income (Loss) from Continuing Operations before Income Taxes, Foreign	338	33	79
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest	3,485	2,109	1,112
Current State and Local Tax Expense (Benefit)	26	10	16
Current Foreign Tax Expense (Benefit)	5	9	3
Current Income Tax Expense (Benefit)	131	50	32
Deferred Federal Income Tax Expense (Benefit)	5	0	(7)
Deferred State and Local Income Tax Expense (Benefit)	1	0	(1)
Deferred Foreign Income Tax Expense (Benefit)	27	(11)	21
Deferred Income Tax Expense (Benefit)	33	(11)	13
Income Tax Expense (Benefit)	164	39	45
Effective Income Tax Rate, Continuing Operations	4.70%	1.80%	4.00%
Deferred Tax Assets, Operating Loss Carryforwards	42	42
Deferred Tax Assets, Other	21	18
Deferred Tax Assets, Net of Valuation Allowance	64	62
Deferred Tax Liabilities, Property, Plant and Equipment	325	303
Deferred Tax Liabilities, Other	11	8
Deferred Tax Liabilities, Gross	336	311
Deferred Tax Liabilities, Net	272	249
Deferred Tax Assets, Net of Valuation Allowance, Current	(13)	0
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense	3	2	1
Unrecognized Tax Benefits, Interest on Income Taxes Accrued	7	5
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit	8
Deferred Tax Liabilities, Net, Noncurrent	$ 285	$ 249