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Fair Value Measurements (Tables)
 6 Months Ended
Jun. 30, 2019
Fair Value Measurements [Abstract]  
Fair Value, by Balance Sheet Grouping [Table Text Block]
The following tables summarize the gross fair value of our financial assets and liabilities measured and recorded at fair value on a recurring basis as of June 30, 2019 and December 31, 2018 based on inputs used to derive their fair values:
 
 
 
Fair Value Measurements at
June 30, 2019
 
Fair Value Total
 
Level 1
 
Level 2
Assets:
 
 
 
 
 
Commodity derivatives:
 
 
 
 
 
Natural Gas:
 
 
 
 
 
Basis Swaps IFERC/NYMEX
$
33

 
$
33

 
$
—

Fixed Swaps/Futures
35

 
35

 
—

Forward Physical Contracts
7

 
—

 
7

Power:
 
 
 
 
 
Forwards
40

 
—

 
40

Futures
7

 
7

 
—

NGLs – Forwards/Swaps
377

 
377

 
—

Refined Products – Futures
1

 
1

 
—

Crude – Forwards/Swaps
40

 
40

 
—

Corn - Forwards/Swaps
1

 
1

 
—

Total commodity derivatives
541

 
494

 
47

Other non-current assets
29

 
19

 
10

Total assets
$
570

 
$
513

 
$
57

Liabilities:
 
 
 
 
 
Interest rate derivatives
$
(354
)
 
$
—

 
$
(354
)
Commodity derivatives:
 
 
 
 
 
Natural Gas:
 
 
 
 
 
Basis Swaps IFERC/NYMEX
(42
)
 
(42
)
 
—

Swing Swaps IFERC
(2
)
 
(1
)
 
(1
)
Fixed Swaps/Futures
(23
)
 
(23
)
 
—

Forward Physical Contracts
(3
)
 
—

 
(3
)
Power:
 
 
 
 
 
Forwards
(31
)
 
—

 
(31
)
Futures
(8
)
 
(8
)
 
—

NGLs – Forwards/Swaps
(409
)
 
(409
)
 
—

Refined Products – Futures
(4
)
 
(4
)
 
—

Crude – Forwards/Swaps
(1
)
 
(1
)
 
—

Total commodity derivatives
(523
)
 
(488
)
 
(35
)
Total liabilities
$
(877
)
 
$
(488
)
 
$
(389
)
 
 
 
Fair Value Measurements at
December 31, 2018
 
Fair Value Total
 
Level 1
 
Level 2
Assets:
 
 
 
 
 
Commodity derivatives:
 
 
 
 
 
Natural Gas:
 
 
 
 
 
Basis Swaps IFERC/NYMEX
$
42

 
$
42

 
$
—

Swing Swaps IFERC
52

 
8

 
44

Fixed Swaps/Futures
97

 
97

 
—

Forward Physical Contracts
20

 
—

 
20

Power:
 
 
 
 
 
Forwards
48

 
—

 
48

Futures
1

 
1

 
—

Options – Calls
1

 
1

 
—

NGLs – Forwards/Swaps
291

 
291

 
—

Refined Products – Futures
7

 
7

 
—

Crude – Forwards/Swaps
1

 
1

 
—

Total commodity derivatives
560

 
448

 
112

Other non-current assets
26

 
17

 
9

Total assets
$
586

 
$
465

 
$
121

Liabilities:
 
 
 
 
 
Interest rate derivatives
$
(163
)
 
$
—

 
$
(163
)
Commodity derivatives:
 
 
 
 
 
Natural Gas:
 
 
 
 
 
Basis Swaps IFERC/NYMEX
(91
)
 
(91
)
 
—

Swing Swaps IFERC
(40
)
 
—

 
(40
)
Fixed Swaps/Futures
(88
)
 
(88
)
 
—

Forward Physical Contracts
(21
)
 
—

 
(21
)
Power:
 
 


 


Forwards
(42
)
 
—

 
(42
)
Futures
(1
)
 
(1
)
 
—

NGLs – Forwards/Swaps
(224
)
 
(224
)
 
—

Refined Products – Futures
(15
)
 
(15
)
 
—

Crude – Forwards/Swaps
(61
)
 
(61
)
 
—

Total commodity derivatives
(583
)
 
(480
)
 
(103
)
Total liabilities
$
(746
)
 
$
(480
)
 
$
(266
)