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Fair Value Measurements (Tables)
 6 Months Ended
Jun. 30, 2018
Fair Value Measurements [Abstract]  
Fair Value Of Financial Assets And Liabilities Measured On Recurring Basis
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, 2018 and December 31, 2017 based on inputs used to derive their fair values:
 
 
 
Fair Value Measurements at
June 30, 2018
 
Fair Value Total
 
Level 1
 
Level 2
Assets:
 
 
 
 
 
Commodity derivatives:
 
 
 
 
 
Natural Gas:
 
 
 
 
 
Basis Swaps IFERC/NYMEX
$
22

 
$
22

 
$
—

Swing Swaps IFERC
1

 
—

 
1

Fixed Swaps/Futures
11

 
11

 
—

Forward Physical Contracts
9

 
—

 
9

Power:
 
 
 
 
 
Forwards
69

 
—

 
69

Options — Puts
1

 
1

 
—

NGLs — Forwards/Swaps
301

 
301

 
—

Refined Products — Futures
3

 
3

 
—

Crude — Forwards/Swaps
1

 
1

 
—

Corn (Bushels)
1

 
1

 
—

Total commodity derivatives
419

 
340

 
79

Other non-current assets
21

 
14

 
7

Total assets
$
440

 
$
354

 
$
86

Liabilities:
 
 
 
 
 
Interest rate derivatives
$
(147
)
 
$
—

 
$
(147
)
Commodity derivatives:
 
 
 
 
 
Natural Gas:
 
 
 
 
 
Basis Swaps IFERC/NYMEX
(70
)
 
(70
)
 
—

Swing Swaps IFERC
(2
)
 
(1
)
 
(1
)
Fixed Swaps/Futures
(14
)
 
(14
)
 
—

Forward Physical Contracts
(5
)
 
—

 
(5
)
Power — Forwards
(57
)
 
—

 
(57
)
NGLs — Forwards/Swaps
(319
)
 
(319
)
 
—

Refined Products — Futures
(9
)
 
(9
)
 
—

Crude — Forwards/Swaps
(308
)
 
(308
)
 
—

Total commodity derivatives
(784
)
 
(721
)
 
(63
)
Total liabilities
$
(931
)
 
$
(721
)
 
$
(210
)
 
 
 
Fair Value Measurements at
December 31, 2017
 
Fair Value Total
 
Level 1
 
Level 2
Assets:
 
 
 
 
 
Commodity derivatives:
 
 
 
 
 
Natural Gas:
 
 
 
 
 
Basis Swaps IFERC/NYMEX
$
11

 
$
11

 
$
—

Swing Swaps IFERC
13

 
—

 
13

Fixed Swaps/Futures
70

 
70

 
—

Forward Physical Swaps
8

 
—

 
8

Power — Forwards
23

 
—

 
23

NGLs — Forwards/Swaps
191

 
191

 
—

Refined Products — Futures
1

 
1

 
—

Crude:
 
 
 
 
 
Forwards/Swaps
2

 
2

 
—

Futures
2

 
2

 
—

Total commodity derivatives
321

 
277

 
44

Other non-current assets
21

 
14

 
7

Total assets
$
342

 
$
291

 
$
51

Liabilities:
 
 
 
 
 
Interest rate derivatives
$
(219
)
 
$
—

 
$
(219
)
Commodity derivatives:
 
 
 
 
 
Natural Gas:
 
 
 
 
 
Basis Swaps IFERC/NYMEX
(24
)
 
(24
)
 
—

Swing Swaps IFERC
(15
)
 
(1
)
 
(14
)
Fixed Swaps/Futures
(57
)
 
(57
)
 
—

Forward Physical Swaps
(2
)
 
—

 
(2
)
Power — Forwards
(22
)
 
—

 
(22
)
NGLs — Forwards/Swaps
(186
)
 
(186
)
 
—

Refined Products — Futures
(28
)
 
(28
)
 
—

Crude:
 
 
 
 
 
Forwards/Swaps
(6
)
 
(6
)
 
—

Futures
(1
)
 
(1
)
 
—

Total commodity derivatives
(341
)
 
(303
)
 
(38
)
Total liabilities
$
(560
)
 
$
(303
)
 
$
(257
)