Fair Value Measurements and Guarantees (Tables)

3 Months Ended

Mar. 31, 2015



							Fair Value Measurements Using
	Carrying Amount			Fair Value			Quoted Prices In Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)			Significant Unobservable Inputs (Level 3)
	(Millions)
Assets (liabilities) at March 31, 2015:
Measured on a recurring basis:
ARO Trust investments	$	60		$	60		$	60	$	—		$	—
Energy derivatives assets not designated as hedging instruments	2			2			—		—			2
Energy derivatives liabilities not designated as hedging instruments	(2		)	(2		)	—		—			(2		)
Additional disclosures:
Notes receivable and other	13			16			1		3			12
Long-term debt, including current portion (1)	(22,487		)	(23,003		)	—		(23,003		)	—
Guarantee	(30		)	(25		)	—		(25		)	—
Assets (liabilities) at December 31, 2014:
Measured on a recurring basis:
ARO Trust investments	$	48		$	48		$	48	$	—		$	—
Energy derivatives assets not designated as hedging instruments	3			3			1		—			2
Energy derivatives liabilities not designated as hedging instruments	(2		)	(2		)	—		—			(2		)
Additional disclosures:
Notes receivable and other	30			57			—		4			53
Long-term debt, including current portion (1)	(20,887		)	(21,131		)	—		(21,131		)	—
Guarantee	(31		)	(27		)	—		(27		)	—

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(1) Excludes capital leases