Schedule II - Valuation and Qualifying Accounts and Allowances (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended				12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2014		Dec. 31, 2013	Dec. 31, 2012
Movement in Valuation Allowances and Reserves [Roll Forward]
Restructuring Charges	$ 58	$ 154	$ 59	$ 70	$ 331		$ 0	$ 0
Allowance for uncollectible accounts receivable [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
of Period				106	106		84	91
Expense (a)					32	[1]	102	22
Additions					(4)		(12)	(8)
Reductions(b)					(26)	[2]	(68)	(21)
Period	108				108		106	84
Restructuring Charges					5
Valuation allowance on deferred tax assets [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
of Period				554	554		317	201
Expense (a)					222		264	108
Additions					0		0	8
Reductions(b)					(44)		(27)	0
Period	$ 732				$ 732		$ 554	$ 317

[1] (a)For the $32 million in bad debt expense in 2014, $5 million is related to the restructuring charges.

[2] (b)Includes amounts reclassified to Assets Held for Sale.