Schedule II - Valuation And Qualifying Accounts (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Doubtful Accounts - Current [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period		$ 82	$ 109	$ 119
Additions Charged to Earnings		11	11	38
Additions Charged to Other Accounts		0	0	0
Deductions from Reserves	[1]	(23)	(38)	(48)
Balance at End of Period		70	82	109
Restructuring Reserves [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period		16	51	17
Additions Charged to Earnings		5	41	46
Additions Charged to Other Accounts		0	0	0
Deductions from Reserves	[2]	(11)	(76)	(12)
Balance at End of Period		$ 10	$ 16	$ 51

[1] Includes write-offs, less recoveries, of accounts determined to be uncollectible and other adjustments.

[2] Includes payments and deductions for reversals of previously established reserves that were no longer required.