Valuation and Qualifying Accounts

12 Months Ended

Dec. 31, 2010

Valuation and Qualifying Accounts [Abstract]

Valuation and Qualifying Accounts

SCHEDULE II — VALUATION AND QUALIFYING ACCOUNTS

				ADDITIONS
				Charged
				(Credited)
	Beginning			To Costs and									Ending
	Balance			Expenses			Other			Deductions			Balance
	(Millions)
2010:
Allowance for doubtful accounts — accounts and notes receivable(a)	$	22		$	(6	)	$	—		$	1	(c)	$	15
Deferred tax asset valuation allowance(a)		289			(40	)		—			—			249
Price-risk management credit reserves — liabilities(b)		(3	)		3	(d)		—			—			—
2009:
Allowance for doubtful accounts — accounts and notes receivable(a)		29			4			—			11	(c)		22
Deferred tax asset valuation allowance(a)		224			65			—			—			289
Price-risk management credit reserves — assets(a)		6			(3	) (d)		(3	) (e)		—			—
Price-risk management credit reserves — liabilities(b)		(15	)		12	(d)		—			—			(3	)
2008:
Allowance for doubtful accounts — accounts and notes receivable(a)		16			15			—			2	(c)		29
Deferred tax asset valuation allowance(a)		274			(14	)		—			36	(c)		224
Price-risk management credit reserves — assets(a)		1			1	(d)		4	(e)		—			6
Price-risk management credit reserves — liabilities(b)		—			(16	) (d)		1	(e)		—			(15	)

(a)	Deducted from related assets.
(b)	Deducted from related liabilities.
(c)	Represents balances written off, reclassifications and recoveries.
(d)	Included in revenues.
(e)	Included in accumulated other comprehensive income (loss).