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Net Income per Limited Partner Unit Table - Income Reconciliation (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Reconciliation of income from continuing operations to income from continuing operations available to limited partners [Line Items]        
Income from continuing operations $ 343 $ 108 $ 972 $ 1,138
Income (Loss) from Continuing Operations Attributable to Noncontrolling Interest 195 45 623 860
Income from continuing operations, net of noncontrolling interest 148 63 349 278
General Partner’s interest in income from continuing operations (1) 0 (1) 0
Income from continuing operations available to Limited Partners 147 63 348 278
Less: General Partner’s interest in income from continuing operations 1 0 1 0
Basic Income from Continuing Operations per Limited Partner Unit:        
Weighted average Limited Partner units 280.7 280.0 280.4 262.3
Basic income from continuing operations per Limited Partner unit 0.52 0.23 1.24 1.06
Basic income from discontinued operations per Limited Partner unit $ 0.02 $ (0.10) $ 0.07 $ (0.09)
Diluted Income from Continuing Operations per Limited Partner Unit:        
Dilutive effect of equity-based compensation of subsidiaries 0 0 (1) (1)
Diluted net income available to Limited Partners $ 147 $ 63 $ 347 $ 277
Weighted average Limited Partner units 280.7 280.0 280.4 262.3
Diluted income from continuing operations per Limited Partner unit 0.52 0.23 1.24 1.06
Diluted income from discontinued operations per Limited Partner unit $ 0.02 $ (0.10) $ 0.07 $ (0.09)