Financial and Derivative Instruments (Details 2) (USD $) In Millions, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Offsetting Assets [Abstract]
Derivative Assets, Gross Amount Recognized	$ 1,384	$ 732
Derivative Assets, Gross Amounts Offset	1,371	704
Derivative Assets, Net Amounts Presented	13	28
Derivative Assets, Gross Amounts Not Offset	12	27
Derivative Assets, Net Amount	1	1
Offsetting Liabilities [Abstract]
Derivative Liabilities, Gross Amount Recognized	1,454	793
Derivative Liabilities, Gross Amounts Offset	1,371	704
Derivative Liabilities	83	89
Derivative Liabilities, Gross Amount Not Offset	0	0
Derivative Liabilities, Net Amount	$ 83	$ 89