Derivative and Other Financial Instruments (Notional Values Of Outstanding Derivative Instruments In The Consolidated Balance Sheet) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Foreign Exchange Contracts [Member]
Derivatives, Fair Value [Line Items]
Derivatives in cash flow hedges: Foreign exchange	$ 471	$ 480
Derivatives in fair value hedges: Foreign exchange	105	123
Derivatives in fair value not designated as hedges: Foreign exchange	924	965
Commodity Contracts [Member]
Derivatives, Fair Value [Line Items]
Derivatives in cash flow hedges: Commodities	$ 434	$ 528