Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 2015

Fair Value Disclosures [Abstract]

Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]

The following tables present assets and liabilities accounted for at fair value on a recurring basis as of June 30, 2015 and December 31, 2014 by fair value hierarchy level.

	June 30, 2015
(In millions)	Level 1		Level 2		Level 3		Total
Derivative instruments, assets
Commodity (a)	$	—	$	5	$	—	$	5
Interest rate	—		11		—		11
Derivative instruments, assets	$	—	$	16	$	—	$	16
Derivative instruments, liabilities
Commodity (a)	$	—	$	26	$	—	$	26
Derivative instruments, liabilities	$	—	$	26	$	—	$	26

^(a) Derivative instruments are recorded on a net basis in the company's balance sheet (see Note 13).

	December 31, 2014
(In millions)	Level 1		Level 2		Level 3		Total
Derivative instruments, assets
Interest rate	$	—	$	8	$	—	$	8
Derivative instruments, assets	$	—	$	8	$	—	$	8

Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Table Text Block]

The following table shows the values of assets, by major category, measured at fair value on a nonrecurring basis in periods subsequent to their initial recognition.

	Three Months Ended June 30,
	2015				2014
(In millions)	Fair Value		Impairment		Fair Value		Impairment
Long-lived assets held for use	$	17	$	44	$	—	$	4

	Six Months Ended June 30,
	2015				2014
(In millions)	Fair Value		Impairment		Fair Value		Impairment
Long-lived assets held for use	$	17	$	44	$	—	$	21

Fair Value, by Balance Sheet Grouping [Table Text Block]

The following table summarizes financial instruments, excluding receivables, short-term investments, payables and derivative financial instruments, and their reported fair value by individual balance sheet line item at June 30, 2015 and December 31, 2014.

	June 30, 2015				December 31, 2014
	Fair		Carrying		Fair		Carrying
(In millions)	Value		Amount		Value		Amount
Financial assets
Other noncurrent assets	$	134	$	133	$	132	$	129
Total financial assets	134		133		132		129
Financial liabilities
Other current liabilities	13		13		13		13
Long-term debt, including current portion (a)	8,720		8,324		6,887		6,360
Deferred credits and other liabilities	73		67		69		68
Total financial liabilities	$	8,806	$	8,404	$	6,969	$	6,441

^(a)    Excludes capital leases.