SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Valuation allowance for deferred tax assets
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year	$ 2,487		$ 2,443		$ 2,393
Additions Charged to Cost and Expense	(53)		44		49
Additons Charged to Other Accounts	0		0		1
Other Additions (Deductions)	0		0		0
Balance at End of Year	2,434		2,487		2,443
Reserves for non-income taxes
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year	78		80		73
Additions Charged to Cost and Expense	16		35		21
Additons Charged to Other Accounts	0		(1)		(2)
Other Additions (Deductions)	(1)	[1]	(36)	[1]	(12)	[1]
Balance at End of Year	$ 93		$ 78		$ 80

[1] Represents amounts paid or adjustments to reserves based on revised estimates.