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Fair Value Measurements (Tables)
 3 Months Ended
Mar. 31, 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 March 31, 2019 and December 31, 2018 based on inputs used to derive their fair values:
 
 
 
Fair Value Measurements at
March 31, 2019
 
Fair Value Total
 
Level 1
 
Level 2
Assets:
 
 
 
 
 
Commodity derivatives:
 
 
 
 
 
Natural Gas:
 
 
 
 
 
Basis Swaps IFERC/NYMEX
$
40

 
$
40

 
$
—

Swing Swaps IFERC
3

 
1

 
2

Fixed Swaps/Futures
16

 
16

 
—

Forward Physical Contracts
10

 
—

 
10

Power:
 
 
 
 
 
Forwards
44

 
—

 
44

Futures
7

 
7

 
—

NGLs – Forwards/Swaps
162

 
162

 
—

Refined Products – Futures
5

 
5

 
—

Crude – Forwards/Swaps
51

 
51

 
—

Total commodity derivatives
338

 
282

 
56

Other non-current assets
28

 
18

 
10

Total assets
$
366

 
$
300

 
$
66

Liabilities:
 
 
 
 
 
Interest rate derivatives
$
(232
)
 
$
—

 
$
(232
)
Commodity derivatives:
 
 
 
 
 
Natural Gas:
 
 
 
 
 
Basis Swaps IFERC/NYMEX
(81
)
 
(81
)
 
—

Swing Swaps IFERC
(4
)
 
(2
)
 
(2
)
Fixed Swaps/Futures
(18
)
 
(18
)
 
—

Forward Physical Contracts
(5
)
 
—

 
(5
)
Power:
 
 
 
 
 
Forwards
(35
)
 
—

 
(35
)
Futures
(6
)
 
(6
)
 
—

NGLs – Forwards/Swaps
(155
)
 
(155
)
 
—

Refined Products – Futures
(4
)
 
(4
)
 
—

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

Total commodity derivatives
(309
)
 
(267
)
 
(42
)
Total liabilities
$
(541
)
 
$
(267
)
 
$
(274
)
 
 
 
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
)