Schedule II - Valuation and Qualifying Accounts (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Accounts Receivable - Allowance for Doubtful Accounts [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at beginning of period		$ 235	$ 262	$ 237
Additions charged to cost and expenses		58	58	70
Deductions from reserves	[1]	(68)	(85)	(45)
Balance at end of period		225	235	262
Inventory Valuation Reserve [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at beginning of period		180	212	250
Additions charged to cost and expenses		391	386	304
Deductions from reserves	[2]	(334)	(418)	(342)
Balance at end of period		237	180	212
Deferred Tax Assets - Valuation Allowance [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at beginning of period		1,704	1,711	1,861
Additions charged to cost and expenses		(71)	(47)	29
(Deductions) additions charged to other comprehensive income (loss)		(104)	40	(179)
Balance at end of period		$ 1,529	$ 1,704	$ 1,711

[1] Deductions include write-offs, recoveries and currency translation adjustments.

[2] Deductions include disposals and currency translation adjustments.