Derivative Instruments and Hedging Activities Derivative Instruments and Hedging Activities Disclosure abstract (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Derivative [Line Items]
Derivative Assets, Gross	$ 307	$ 280
Foreign Exchange Contract [Member]
Derivative [Line Items]
Derivative Assets, Gross	261	236
Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative Assets, Gross	268	249
Not Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member]
Derivative [Line Items]
Derivative Assets, Gross	$ 252	$ 230