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	Dec. 31, 2014	Dec. 31, 2013
Not Designated As Hedging Instrument [Member]
Derivative [Line Items]
FX Contracts Assets	$ 186	$ 118
Interest Contracts Assets	0	1
Commodity Contracts Assets	690	850
Total fair value of derivative assets not designated as hedging instruments	876	969
FX Contracts Liabilities	150	166
Commodity Contracts Liabilities	776	649
Total fair value of derivative liabilities not designated as hedging instruments.	$ 926	$ 815