Derivative Instruments and Hedging Activities (Fair Value Of Derivatives Not Designated As Hedging Instruments) (Details) (Not Designated As Hedging Instrument [Member], USD $) In Millions, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Not Designated As Hedging Instrument [Member]
Derivative [Line Items]
FX Contracts Assets	$ 211	$ 186
Commodity Contracts Assets	605	690
Total fair value of derivative assets not designated as hedging instruments	816	876
FX Contracts Liabilities	288	150
Commodity Contracts Liabilities	629	776
Total fair value of derivative liabilities not designated as hedging instruments.	$ 917	$ 926