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, 2018 and December 31, 2017 based on inputs used to derive their fair values:



				Fair Value Measurements at March 31, 2018
	Fair Value Total			Level 1			Level 2
Assets:
Commodity derivatives:
Natural Gas:
Basis Swaps IFERC/NYMEX	$	35		$	35		$	—
Swing Swaps IFERC	1			—			1
Fixed Swaps/Futures	14			14			—
Forward Physical Contracts	7			—			7
Power — Forwards	78			—			78
Options — Calls	1			1			—
Options — Puts	1			1			—
Natural Gas Liquids — Forwards/Swaps	115			115			—
Refined Products — Futures	3			3			—
Total commodity derivatives	255			169			86
Other non-current assets	21			14			7
Total assets	$	276		$	183		$	93
Liabilities:
Interest rate derivatives	$	(167	)	$	—		$	(167	)
Commodity derivatives:
Natural Gas:
Basis Swaps IFERC/NYMEX	(81		)	(81		)	—
Swing Swaps IFERC	(1		)	—			(1		)
Fixed Swaps/Futures	(13		)	(13		)	—
Options — Calls	(2		)	(2		)	—
Forward Physical Contracts	(6		)	—			(6		)
Power:
Forwards	(72		)	—			(72		)
Natural Gas Liquids — Swaps	(169		)	(169		)	—
Refined Products — Futures	(6		)	(6		)	—
Total commodity derivatives	(350		)	(271		)	(79		)
Total liabilities	$	(517	)	$	(271	)	$	(246	)



				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
Natural Gas Liquids — Forwards/Swaps	193			193			—
Refined Products — Futures	1			1			—
Crude — 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		)
Natural Gas Liquids — Swaps	(192		)	(192		)	—
Refined Products — Futures	(28		)	(28		)	—
Crude — Futures	(1		)	(1		)	—
Total commodity derivatives	(341		)	(303		)	(38		)
Total liabilities	$	(560	)	$	(303	)	$	(257	)