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Net Income Per Limited Partner Unit (Tables)
 6 Months Ended
Jun. 30, 2014
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
A reconciliation of income from continuing operations and weighted average units used in computing basic and diluted income from continuing operations per unit is as follows:
 
Three Months Ended
June 30,
 
Six Months Ended
June 30,
 
2014
 
2013
 
2014
 
2013
Income from continuing operations
$
539

 
$
404

 
$
1,006

 
$
806

Less: Income from continuing operations attributable to noncontrolling interest
110

 
89

 
186

 
178

Income from continuing operations, net of noncontrolling interest
429

 
315

 
820

 
628

General Partner’s interest in income from continuing operations
125

 
154

 
238

 
282

Class H Unitholder’s interest in income from continuing operations
51

 
—

 
100

 
—

Common Unitholders’ interest in income from continuing operations
253

 
161

 
482

 
346

Additional earnings allocated from (to) General Partner
1

 
23

 
(2
)
 
—

Distributions on employee unit awards, net of allocation to General Partner
(3
)
 
(2
)
 
(6
)
 
(5
)
Income from continuing operations available to Common Unitholders
$
251

 
$
182

 
$
474

 
$
341

Weighted average Common Units – basic
318.5

 
352.6

 
321.4

 
326.9

Basic income from continuing operations per Common Unit
$
0.79

 
$
0.52

 
$
1.47

 
$
1.04

Dilutive effect of unvested Unit Awards
1.0

 
1.2

 
1.0

 
1.2

Weighted average Common Units, assuming dilutive effect of unvested Unit Awards
319.5

 
353.8

 
322.4

 
328.1

Diluted income from continuing operations per Common Unit
$
0.79

 
$
0.52

 
$
1.47

 
$
1.04

Basic income from discontinued operations per Common Unit
$
0.13

 
$
0.01

 
$
0.20

 
$
0.04

Diluted income from discontinued operations per Common Unit
$
0.13

 
$
0.01

 
$
0.20

 
$
0.04